257268555 has 40 divisors (see below), whose sum is σ = 462363264. Its totient is φ = 136857600.

The previous prime is 257268533. The next prime is 257268587. The reversal of 257268555 is 555862752.

257268555 is a `hidden beast` number, since 25 + 72 + 6 + 8 + 555 = 666.

It is not a de Polignac number, because 257268555 - 2⁹ = 257268043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 257268555.

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 259110 + ... + 260100.

Almost surely, 2^257268555 is an apocalyptic number.

257268555 is a deficient number, since it is larger than the sum of its proper divisors (205094709).

257268555 is an equidigital number, since it uses as much as digits as its factorization.

257268555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649 (or 1640 counting only the distinct ones).

The product of its digits is 840000, while the sum is 45.

The square root of 257268555 is about 16039.5933551945. The cubic root of 257268555 is about 636.0074981316.

The spelling of 257268555 in words is "two hundred fifty-seven million, two hundred sixty-eight thousand, five hundred fifty-five".