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12561663316 = 2229108799623
BaseRepresentation
bin10111011001011101…
…11100010101010100
31012102102222121120111
423230232330111110
5201211241211231
65434252012404
7623201243056
oct135456742524
935372877514
1012561663316
115366805634
122526a61104
131252629997
148724658d6
154d7c194b1
hex2ecbbc554

12561663316 has 24 divisors (see below), whose sum is σ = 22762091520. Its totient is φ = 6058611552.

The previous prime is 12561663293. The next prime is 12561663397. The reversal of 12561663316 is 61336616521.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76281 + ... + 175903.

It is an arithmetic number, because the mean of its divisors is an integer number (948420480).

Almost surely, 212561663316 is an apocalyptic number.

It is an amenable number.

12561663316 is a deficient number, since it is larger than the sum of its proper divisors (10200428204).

12561663316 is a wasteful number, since it uses less digits than its factorization.

12561663316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100743 (or 100741 counting only the distinct ones).

The product of its digits is 116640, while the sum is 40.

The spelling of 12561663316 in words is "twelve billion, five hundred sixty-one million, six hundred sixty-three thousand, three hundred sixteen".

Divisors: 1 2 4 29 58 116 1087 2174 4348 31523 63046 99623 126092 199246 398492 2889067 5778134 11556268 108290201 216580402 433160804 3140415829 6280831658 12561663316