256655306731 has 8 divisors (see below), whose sum is σ = 257576387328. Its totient is φ = 255734841000.

The previous prime is 256655306701. The next prime is 256655306749. The reversal of 256655306731 is 137603556652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256655306731 - 2³¹ = 254507823083 is a prime.

It is a super-2 number, since 2×256655306731² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256655306701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690916 + ... + 995326.

It is an arithmetic number, because the mean of its divisors is an integer number (32197048416).

Almost surely, 2^256655306731 is an apocalyptic number.

256655306731 is a deficient number, since it is larger than the sum of its proper divisors (921080597).

256655306731 is a wasteful number, since it uses less digits than its factorization.

256655306731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307433.

The product of its (nonzero) digits is 3402000, while the sum is 49.

The spelling of 256655306731 in words is "two hundred fifty-six billion, six hundred fifty-five million, three hundred six thousand, seven hundred thirty-one".