Number 65

A page of the Numeropedia - the Special Encyclopedia of Numbers

[60-69]6061 - 62 - 63 - 64 - 65 -  66 - 67 - 68 - 69

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[Chemistry]  The atomic number of Terbium (Tb). An element in the Lanthanide series: Lanthanum (57) to Lutetium (71).

[Geology]  I-65, the shortest major U.S. North-South interstate highway, connecting Gary, Indiana to Mobile, Alabama, 888 miles. It is the shortest major U.S. interstate highway.

[Language]  The number of letters (and spaces) in the city of Los Angles’ full name: "El Pueblo de Nuestra Senora la Reina de los Angeles de Porciuncula", a total of 12 words. It is usually abbreviated to only L.A.

[Math.]  65 = 15+24+33+42+51.

[Math.]  A number that can be sum of 2 different square numbers in 2 ways: 65 = 42+72 = 12+82.

[Math.]  The smallest number whose square is the sum of 2 different square numbers in 2 ways: 652 = 4225 = 632+162 = 562+332.

[Math.]  654 = 17,850,625 = 644+324+124+84+14 524+464+444+394+24.

[Math.]  Repeatedly inserting numbers 42 between the digits 4 and 2 in the square number 4225 = 652 yields other squares 442225 = 6652, 44422225 = 66652, 444222225 = 666652, 44442222225 = 6666652

[Math.]  65+56 = 112 and 65–56 = 32.

[Math.]  490,689 = 43+603+653 = 83+253+783 and

15,600 =  4×60×65    =   8×25×78.

[Phone]  International telephone dialing code for Singapore.

[Trivia]  The U.S. highway speed limit is typically 65 miles/hour in most states. U.S. freeway speed limits for automobiles are 55, 65, 70 or 75 miles/hour.