256530775642 has 64 divisors (see below), whose sum is σ = 418775508000. Its totient is φ = 117402787840.

The previous prime is 256530775621. The next prime is 256530775661. The reversal of 256530775642 is 246577035652.

It can be written as a sum of positive squares in 16 ways, for example, as 157274903241 + 99255872401 = 396579^2 + 315049^2 .

It is a super-2 number, since 2×256530775642² (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 256530775642.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217214292 + ... + 217215472.

Almost surely, 2^256530775642 is an apocalyptic number.

256530775642 is a deficient number, since it is larger than the sum of its proper divisors (162244732358).

256530775642 is a wasteful number, since it uses less digits than its factorization.

256530775642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211.

The product of its (nonzero) digits is 10584000, while the sum is 52.

The spelling of 256530775642 in words is "two hundred fifty-six billion, five hundred thirty million, seven hundred seventy-five thousand, six hundred forty-two".