1156317006561 has 24 divisors (see below), whose sum is σ = 1653846897024. Its totient is φ = 718333215840.

The previous prime is 1156317006539. The next prime is 1156317006571. The reversal of 1156317006561 is 1656007136511.

It is not a de Polignac number, because 1156317006561 - 2⁷ = 1156317006433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1156317006521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8685561 + ... + 8817686.

It is an arithmetic number, because the mean of its divisors is an integer number (68910287376).

Almost surely, 2^{1156317006561} is an apocalyptic number.

It is an amenable number.

1156317006561 is a deficient number, since it is larger than the sum of its proper divisors (497529890463).

1156317006561 is a wasteful number, since it uses less digits than its factorization.

1156317006561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17503349 (or 17503330 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 42.

The spelling of 1156317006561 in words is "one trillion, one hundred fifty-six billion, three hundred seventeen million, six thousand, five hundred sixty-one".