257679821157 has 16 divisors (see below), whose sum is σ = 377503472640. Its totient is φ = 155046063600.

The previous prime is 257679821111. The next prime is 257679821251. The reversal of 257679821157 is 751128976752.

It is not a de Polignac number, because 257679821157 - 2⁸ = 257679820901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257679821157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257679821257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28083469 + ... + 28092642.

It is an arithmetic number, because the mean of its divisors is an integer number (23593967040).

Almost surely, 2^257679821157 is an apocalyptic number.

It is an amenable number.

257679821157 is a deficient number, since it is larger than the sum of its proper divisors (119823651483).

257679821157 is a wasteful number, since it uses less digits than its factorization.

257679821157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56176264.

The product of its digits is 14817600, while the sum is 60.

The spelling of 257679821157 in words is "two hundred fifty-seven billion, six hundred seventy-nine million, eight hundred twenty-one thousand, one hundred fifty-seven".