257718677406 has 16 divisors (see below), whose sum is σ = 515873810448. Its totient is φ = 85833483200.

The previous prime is 257718677399. The next prime is 257718677429. The reversal of 257718677406 is 604776817752.

It is a self number, because there is not a number n which added to its sum of digits gives 257718677406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18177975 + ... + 18192146.

It is an arithmetic number, because the mean of its divisors is an integer number (32242113153).

Almost surely, 2^257718677406 is an apocalyptic number.

257718677406 is an abundant number, since it is smaller than the sum of its proper divisors (258155133042).

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

257718677406 is a wasteful number, since it uses less digits than its factorization.

257718677406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36371307.

The product of its (nonzero) digits is 27659520, while the sum is 60.

The spelling of 257718677406 in words is "two hundred fifty-seven billion, seven hundred eighteen million, six hundred seventy-seven thousand, four hundred six".