256439439418212 has 72 divisors (see below), whose sum is σ = 648604053901440. Its totient is φ = 85429424934720.

The previous prime is 256439439418193. The next prime is 256439439418229. The reversal of 256439439418212 is 212814934934652.

It is a happy number.

256439439418212 is a `hidden beast` number, since 2 + 5 + 6 + 4 + 3 + 9 + 439 + 4 + 182 + 12 = 666.

It is a super-2 number, since 2×256439439418212² (a number of 30 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 256439439418212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2299993938 + ... + 2300105430.

It is an arithmetic number, because the mean of its divisors is an integer number (9008389637520).

Almost surely, 2^{256439439418212} is an apocalyptic number.

It is an amenable number.

256439439418212 is an abundant number, since it is smaller than the sum of its proper divisors (392164614483228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256439439418212 is a wasteful number, since it uses less digits than its factorization.

256439439418212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148593 (or 148588 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 63.

The spelling of 256439439418212 in words is "two hundred fifty-six trillion, four hundred thirty-nine billion, four hundred thirty-nine million, four hundred eighteen thousand, two hundred twelve".