256586431772 has 24 divisors (see below), whose sum is σ = 518661344880. Its totient is φ = 109769596160.

The previous prime is 256586431769. The next prime is 256586431781. The reversal of 256586431772 is 277134685652.

It is a super-2 number, since 2×256586431772² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171514247 + ... + 171515742.

It is an arithmetic number, because the mean of its divisors is an integer number (21610889370).

Almost surely, 2^256586431772 is an apocalyptic number.

256586431772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

256586431772 is an abundant number, since it is smaller than the sum of its proper divisors (262074913108).

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

256586431772 is a wasteful number, since it uses less digits than its factorization.

256586431772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343030021 (or 343030019 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 56.

The spelling of 256586431772 in words is "two hundred fifty-six billion, five hundred eighty-six million, four hundred thirty-one thousand, seven hundred seventy-two".