257449857939 has 6 divisors (see below), whose sum is σ = 371872017036. Its totient is φ = 171633238620.

The previous prime is 257449857887. The next prime is 257449857941. The reversal of 257449857939 is 939758944752.

257449857939 is a `hidden beast` number, since 2 + 5 + 7 + 4 + 49 + 8 + 579 + 3 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-257449857939 is a prime.

It is a super-2 number, since 2×257449857939² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257449857839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14302769877 + ... + 14302769894.

It is an arithmetic number, because the mean of its divisors is an integer number (61978669506).

Almost surely, 2^257449857939 is an apocalyptic number.

257449857939 is a deficient number, since it is larger than the sum of its proper divisors (114422159097).

257449857939 is a wasteful number, since it uses less digits than its factorization.

257449857939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28605539777 (or 28605539774 counting only the distinct ones).

The product of its digits is 685843200, while the sum is 72.

The spelling of 257449857939 in words is "two hundred fifty-seven billion, four hundred forty-nine million, eight hundred fifty-seven thousand, nine hundred thirty-nine".