257396665234 has 24 divisors (see below), whose sum is σ = 407607918732. Its totient is φ = 121883863200.

The previous prime is 257396665213. The next prime is 257396665247. The reversal of 257396665234 is 432566693752.

It can be written as a sum of positive squares in 2 ways, for example, as 256292100009 + 1104565225 = 506253^2 + 33235^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1097529 + ... + 1311244.

Almost surely, 2^257396665234 is an apocalyptic number.

257396665234 is a deficient number, since it is larger than the sum of its proper divisors (150211253498).

257396665234 is a wasteful number, since it uses less digits than its factorization.

257396665234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408922 (or 2408899 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 58.

The spelling of 257396665234 in words is "two hundred fifty-seven billion, three hundred ninety-six million, six hundred sixty-five thousand, two hundred thirty-four".