251655556152 has 128 divisors (see below), whose sum is σ = 844718031360. Its totient is φ = 60336990720.

The previous prime is 251655556147. The next prime is 251655556193.

251655556152 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5213563 + ... + 5261610.

It is an arithmetic number, because the mean of its divisors is an integer number (6599359620).

Almost surely, 2^251655556152 is an apocalyptic number.

251655556152 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

251655556152 is an abundant number, since it is smaller than the sum of its proper divisors (593062475208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251655556152 is a wasteful number, since it uses less digits than its factorization.

251655556152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10475213 (or 10475209 counting only the distinct ones).

The product of its digits is 2250000, while the sum is 48.

The spelling of 251655556152 in words is "two hundred fifty-one billion, six hundred fifty-five million, five hundred fifty-six thousand, one hundred fifty-two".