255556251 has 12 divisors (see below), whose sum is σ = 388565320. Its totient is φ = 161403840.

The previous prime is 255556229. The next prime is 255556261. The reversal of 255556251 is 152655552.

255556251 is a `hidden beast` number, since 2 + 55 + 556 + 2 + 51 = 666.

It is not a de Polignac number, because 255556251 - 2⁷ = 255556123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255556201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 747070 + ... + 747411.

Almost surely, 2^255556251 is an apocalyptic number.

255556251 is a deficient number, since it is larger than the sum of its proper divisors (133009069).

255556251 is a wasteful number, since it uses less digits than its factorization.

255556251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494506 (or 1494503 counting only the distinct ones).

The product of its digits is 75000, while the sum is 36.

The square root of 255556251 is about 15986.1268292229. The cubic root of 255556251 is about 634.5933296273.

The spelling of 255556251 in words is "two hundred fifty-five million, five hundred fifty-six thousand, two hundred fifty-one".