15556561510656 has 144 divisors (see below), whose sum is σ = 44083534219200. Its totient is φ = 4853223849984.

The previous prime is 15556561510583. The next prime is 15556561510663. The reversal of 15556561510656 is 65601516565551.

It is a junction number, because it is equal to n+sod(n) for n = 15556561510596 and 15556561510605.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 991261 + ... + 5665308.

It is an arithmetic number, because the mean of its divisors is an integer number (306135654300).

Almost surely, 2^{15556561510656} is an apocalyptic number.

15556561510656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15556561510656 is an abundant number, since it is smaller than the sum of its proper divisors (28526972708544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15556561510656 is a wasteful number, since it uses less digits than its factorization.

15556561510656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6656784 (or 6656770 counting only the distinct ones).

The product of its (nonzero) digits is 20250000, while the sum is 57.

The spelling of 15556561510656 in words is "fifteen trillion, five hundred fifty-six billion, five hundred sixty-one million, five hundred ten thousand, six hundred fifty-six".