257139851844 has 12 divisors (see below), whose sum is σ = 599992987664. Its totient is φ = 85713283944.

The previous prime is 257139851833. The next prime is 257139851867. The reversal of 257139851844 is 448158931752.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×257139851844² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10714160482 + ... + 10714160505.

Almost surely, 2^257139851844 is an apocalyptic number.

It is an amenable number.

257139851844 is an abundant number, since it is smaller than the sum of its proper divisors (342853135820).

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

257139851844 is a wasteful number, since it uses less digits than its factorization.

257139851844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21428320994 (or 21428320992 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 57.

The spelling of 257139851844 in words is "two hundred fifty-seven billion, one hundred thirty-nine million, eight hundred fifty-one thousand, eight hundred forty-four".