256621055454202 has 16 divisors (see below), whose sum is σ = 391594711183200. Its totient is φ = 126091027991920.

The previous prime is 256621055454163. The next prime is 256621055454277. The reversal of 256621055454202 is 202454550126652.

It is a super-2 number, since 2×256621055454202² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385398949 + ... + 386064232.

It is an arithmetic number, because the mean of its divisors is an integer number (24474669448950).

Almost surely, 2^{256621055454202} is an apocalyptic number.

256621055454202 is a deficient number, since it is larger than the sum of its proper divisors (134973655728998).

256621055454202 is a wasteful number, since it uses less digits than its factorization.

256621055454202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771466061.

The product of its (nonzero) digits is 5760000, while the sum is 49.

The spelling of 256621055454202 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, fifty-five million, four hundred fifty-four thousand, two hundred two".