256556656016 has 20 divisors (see below), whose sum is σ = 497232563100. Its totient is φ = 128238575232.

The previous prime is 256556656009. The next prime is 256556656021. The reversal of 256556656016 is 610656655652.

It can be written as a sum of positive squares in 2 ways, for example, as 103130899600 + 153425756416 = 321140^2 + 391696^2 .

It is a super-2 number, since 2×256556656016² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2431271 + ... + 2534598.

It is an arithmetic number, because the mean of its divisors is an integer number (24861628155).

Almost surely, 2^256556656016 is an apocalyptic number.

It is an amenable number.

256556656016 is a deficient number, since it is larger than the sum of its proper divisors (240675907084).

256556656016 is a wasteful number, since it uses less digits than its factorization.

256556656016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4969106 (or 4969100 counting only the distinct ones).

The product of its (nonzero) digits is 9720000, while the sum is 53.

The spelling of 256556656016 in words is "two hundred fifty-six billion, five hundred fifty-six million, six hundred fifty-six thousand, sixteen".