257439802564 has 12 divisors (see below), whose sum is σ = 514879605184. Its totient is φ = 110331343944.

The previous prime is 257439802547. The next prime is 257439802597. The reversal of 257439802564 is 465208934752.

It is a happy number.

257439802564 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4597139304 + ... + 4597139359.

Almost surely, 2^257439802564 is an apocalyptic number.

It is an amenable number.

257439802564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

257439802564 is a wasteful number, since it uses less digits than its factorization.

257439802564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9194278674 (or 9194278672 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 55.

The spelling of 257439802564 in words is "two hundred fifty-seven billion, four hundred thirty-nine million, eight hundred two thousand, five hundred sixty-four".