257351278679 has 8 divisors (see below), whose sum is σ = 295522999680. Its totient is φ = 221642249400.

The previous prime is 257351278627. The next prime is 257351278699. The reversal of 257351278679 is 976872153752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257351278679 - 2⁸ = 257351278423 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 (257351278699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615672707 + ... + 615673124.

It is an arithmetic number, because the mean of its divisors is an integer number (36940374960).

Almost surely, 2^257351278679 is an apocalyptic number.

257351278679 is a deficient number, since it is larger than the sum of its proper divisors (38171721001).

257351278679 is a wasteful number, since it uses less digits than its factorization.

257351278679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231345861.

The product of its digits is 44452800, while the sum is 62.

The spelling of 257351278679 in words is "two hundred fifty-seven billion, three hundred fifty-one million, two hundred seventy-eight thousand, six hundred seventy-nine".