256290869836 has 6 divisors (see below), whose sum is σ = 448509022220. Its totient is φ = 128145434916.

The previous prime is 256290869827. The next prime is 256290869837. The reversal of 256290869836 is 638968092652.

It is a happy number.

It is a super-2 number, since 2×256290869836² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256290869837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32036358726 + ... + 32036358733.

Almost surely, 2^256290869836 is an apocalyptic number.

It is an amenable number.

256290869836 is a deficient number, since it is larger than the sum of its proper divisors (192218152384).

256290869836 is a wasteful number, since it uses less digits than its factorization.

256290869836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64072717463 (or 64072717461 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 64.

The spelling of 256290869836 in words is "two hundred fifty-six billion, two hundred ninety million, eight hundred sixty-nine thousand, eight hundred thirty-six".