257654374238 has 4 divisors (see below), whose sum is σ = 386481561360. Its totient is φ = 128827187118.

The previous prime is 257654374207. The next prime is 257654374249. The reversal of 257654374238 is 832473456752.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64413593558 + ... + 64413593561.

It is an arithmetic number, because the mean of its divisors is an integer number (96620390340).

Almost surely, 2^257654374238 is an apocalyptic number.

257654374238 is a deficient number, since it is larger than the sum of its proper divisors (128827187122).

257654374238 is a wasteful number, since it uses less digits than its factorization.

257654374238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128827187121.

The product of its digits is 33868800, while the sum is 56.

The spelling of 257654374238 in words is "two hundred fifty-seven billion, six hundred fifty-four million, three hundred seventy-four thousand, two hundred thirty-eight".