257345662545 has 80 divisors (see below), whose sum is σ = 485912845440. Its totient is φ = 129942372096.

The previous prime is 257345662531. The next prime is 257345662579. The reversal of 257345662545 is 545266543752.

257345662545 is a `hidden beast` number, since 2 + 5 + 7 + 3 + 4 + 5 + 6 + 625 + 4 + 5 = 666.

It is not a de Polignac number, because 257345662545 - 2⁵ = 257345662513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257345662491 and 257345662500.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 12740524 + ... + 12760706.

It is an arithmetic number, because the mean of its divisors is an integer number (6073910568).

Almost surely, 2^257345662545 is an apocalyptic number.

It is an amenable number.

257345662545 is a deficient number, since it is larger than the sum of its proper divisors (228567182895).

257345662545 is a wasteful number, since it uses less digits than its factorization.

257345662545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21876 (or 21867 counting only the distinct ones).

The product of its digits is 30240000, while the sum is 54.

The spelling of 257345662545 in words is "two hundred fifty-seven billion, three hundred forty-five million, six hundred sixty-two thousand, five hundred forty-five".