257694720039 has 6 divisors (see below), whose sum is σ = 372225706736. Its totient is φ = 171796480020.

The previous prime is 257694719921. The next prime is 257694720043. The reversal of 257694720039 is 930027496752.

257694720039 is a `hidden beast` number, since 2 + 576 + 9 + 47 + 20 + 0 + 3 + 9 = 666.

It is not a de Polignac number, because 257694720039 - 2²⁰ = 257693671463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257694920039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14316373327 + ... + 14316373344.

Almost surely, 2^257694720039 is an apocalyptic number.

257694720039 is a deficient number, since it is larger than the sum of its proper divisors (114530986697).

257694720039 is a wasteful number, since it uses less digits than its factorization.

257694720039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28632746677 (or 28632746674 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 54.

The spelling of 257694720039 in words is "two hundred fifty-seven billion, six hundred ninety-four million, seven hundred twenty thousand, thirty-nine".