257645051 has 4 divisors (see below), whose sum is σ = 258275400. Its totient is φ = 257014704.

The previous prime is 257645039. The next prime is 257645053. The reversal of 257645051 is 150546752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257645051 - 2⁶ = 257644987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257645053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314561 + ... + 315378.

It is an arithmetic number, because the mean of its divisors is an integer number (64568850).

Almost surely, 2^257645051 is an apocalyptic number.

257645051 is a deficient number, since it is larger than the sum of its proper divisors (630349).

257645051 is an equidigital number, since it uses as much as digits as its factorization.

257645051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630348.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 257645051 is about 16051.3255215886. The cubic root of 257645051 is about 636.3175989460.

The spelling of 257645051 in words is "two hundred fifty-seven million, six hundred forty-five thousand, fifty-one".