256360660985 has 128 divisors (see below), whose sum is σ = 386893946880. Its totient is φ = 160412313600.

The previous prime is 256360660979. The next prime is 256360660993. The reversal of 256360660985 is 589066063652.

It is not a de Polignac number, because 256360660985 - 2²⁰ = 256359612409 is a prime.

It is a super-2 number, since 2×256360660985² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256360660985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 103914722 + ... + 103917188.

It is an arithmetic number, because the mean of its divisors is an integer number (3022608960).

Almost surely, 2^256360660985 is an apocalyptic number.

It is an amenable number.

256360660985 is a deficient number, since it is larger than the sum of its proper divisors (130533285895).

256360660985 is a wasteful number, since it uses less digits than its factorization.

256360660985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679.

The product of its (nonzero) digits is 13996800, while the sum is 56.

The spelling of 256360660985 in words is "two hundred fifty-six billion, three hundred sixty million, six hundred sixty thousand, nine hundred eighty-five".