257877778751 has 16 divisors (see below), whose sum is σ = 290294518464. Its totient is φ = 227775634944.

The previous prime is 257877778733. The next prime is 257877778801. The reversal of 257877778751 is 157877778752.

It is a cyclic number.

It is not a de Polignac number, because 257877778751 - 2²⁶ = 257810669887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257877778451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6201296 + ... + 6242741.

It is an arithmetic number, because the mean of its divisors is an integer number (18143407404).

Almost surely, 2^257877778751 is an apocalyptic number.

257877778751 is a deficient number, since it is larger than the sum of its proper divisors (32416739713).

257877778751 is a wasteful number, since it uses less digits than its factorization.

257877778751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12444130.

The product of its digits is 376476800, while the sum is 71.

Subtracting from 257877778751 its reverse (157877778752), we obtain a palindrome (99999999999).

The spelling of 257877778751 in words is "two hundred fifty-seven billion, eight hundred seventy-seven million, seven hundred seventy-eight thousand, seven hundred fifty-one".