257944678436 has 36 divisors (see below), whose sum is σ = 478081503900. Its totient is φ = 121628985408.

The previous prime is 257944678427. The next prime is 257944678463. The reversal of 257944678436 is 634876449752.

It can be written as a sum of positive squares in 2 ways, for example, as 110826404836 + 147118273600 = 332906^2 + 383560^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 386831 + ... + 815798.

It is an arithmetic number, because the mean of its divisors is an integer number (13280041775).

Almost surely, 2^257944678436 is an apocalyptic number.

It is an amenable number.

257944678436 is a deficient number, since it is larger than the sum of its proper divisors (220136825464).

257944678436 is a wasteful number, since it uses less digits than its factorization.

257944678436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202748 (or 1202703 counting only the distinct ones).

The product of its digits is 243855360, while the sum is 65.

The spelling of 257944678436 in words is "two hundred fifty-seven billion, nine hundred forty-four million, six hundred seventy-eight thousand, four hundred thirty-six".