257961651 has 16 divisors (see below), whose sum is σ = 362419200. Its totient is φ = 162757728.

The previous prime is 257961647. The next prime is 257961661. The reversal of 257961651 is 156169752.

It is not a de Polignac number, because 257961651 - 2² = 257961647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257961611) 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, 79870 + ... + 83036.

It is an arithmetic number, because the mean of its divisors is an integer number (22651200).

Almost surely, 2^257961651 is an apocalyptic number.

257961651 is a deficient number, since it is larger than the sum of its proper divisors (104457549).

257961651 is a wasteful number, since it uses less digits than its factorization.

257961651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4618.

The product of its digits is 113400, while the sum is 42.

The square root of 257961651 is about 16061.1846076185. The cubic root of 257961651 is about 636.5781326901.

The spelling of 257961651 in words is "two hundred fifty-seven million, nine hundred sixty-one thousand, six hundred fifty-one".