256785445512 has 128 divisors (see below), whose sum is σ = 771127920000. Its totient is φ = 78898468608.

The previous prime is 256785445489. The next prime is 256785445529. The reversal of 256785445512 is 215544587652.

256785445512 is a `hidden beast` number, since 2 + 5 + 6 + 7 + 85 + 4 + 4 + 551 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 693687 + ... + 997382.

It is an arithmetic number, because the mean of its divisors is an integer number (6024436875).

Almost surely, 2^256785445512 is an apocalyptic number.

It is an amenable number.

256785445512 is an abundant number, since it is smaller than the sum of its proper divisors (514342474488).

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

256785445512 is a wasteful number, since it uses less digits than its factorization.

256785445512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691140 (or 1691130 counting only the distinct ones).

The product of its digits is 13440000, while the sum is 54.

The spelling of 256785445512 in words is "two hundred fifty-six billion, seven hundred eighty-five million, four hundred forty-five thousand, five hundred twelve".