251556131055 has 16 divisors (see below), whose sum is σ = 415473352704. Its totient is φ = 129835422240.

The previous prime is 251556131033. The next prime is 251556131083. The reversal of 251556131055 is 550131655152.

It is not a de Polignac number, because 251556131055 - 2⁷ = 251556130927 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270489999 + ... + 270490928.

It is an arithmetic number, because the mean of its divisors is an integer number (25967084544).

Almost surely, 2^251556131055 is an apocalyptic number.

251556131055 is a deficient number, since it is larger than the sum of its proper divisors (163917221649).

251556131055 is a wasteful number, since it uses less digits than its factorization.

251556131055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540980966.

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 251556131055 in words is "two hundred fifty-one billion, five hundred fifty-six million, one hundred thirty-one thousand, fifty-five".