257384655464 has 8 divisors (see below), whose sum is σ = 482596229010. Its totient is φ = 128692327728.

The previous prime is 257384655413. The next prime is 257384655487. The reversal of 257384655464 is 464556483752.

It can be written as a sum of positive squares in only one way, i.e., 237061872100 + 20322783364 = 486890^2 + 142558^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16086540959 + ... + 16086540974.

Almost surely, 2^257384655464 is an apocalyptic number.

It is an amenable number.

257384655464 is a deficient number, since it is larger than the sum of its proper divisors (225211573546).

257384655464 is a wasteful number, since it uses less digits than its factorization.

257384655464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32173081939 (or 32173081935 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 59.

The spelling of 257384655464 in words is "two hundred fifty-seven billion, three hundred eighty-four million, six hundred fifty-five thousand, four hundred sixty-four".