256431084761 has 8 divisors (see below), whose sum is σ = 256884734400. Its totient is φ = 255977521488.

The previous prime is 256431084737. The next prime is 256431084781. The reversal of 256431084761 is 167480134652.

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 256431084761 - 2¹⁰ = 256431083737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256431084781) 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, 9730775 + ... + 9757091.

It is an arithmetic number, because the mean of its divisors is an integer number (32110591800).

Almost surely, 2^256431084761 is an apocalyptic number.

It is an amenable number.

256431084761 is a deficient number, since it is larger than the sum of its proper divisors (453649639).

256431084761 is a wasteful number, since it uses less digits than its factorization.

256431084761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43183.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 256431084761 in words is "two hundred fifty-six billion, four hundred thirty-one million, eighty-four thousand, seven hundred sixty-one".