257838978198 has 16 divisors (see below), whose sum is σ = 515686498416. Its totient is φ = 85944902400.

The previous prime is 257838978161. The next prime is 257838978277. The reversal of 257838978198 is 891879838752.

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, 76990 + ... + 722222.

It is an arithmetic number, because the mean of its divisors is an integer number (32230406151).

Almost surely, 2^257838978198 is an apocalyptic number.

257838978198 is an abundant number, since it is smaller than the sum of its proper divisors (257847520218).

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

257838978198 is a wasteful number, since it uses less digits than its factorization.

257838978198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711839.

The product of its digits is 487710720, while the sum is 75.

The spelling of 257838978198 in words is "two hundred fifty-seven billion, eight hundred thirty-eight million, nine hundred seventy-eight thousand, one hundred ninety-eight".