251605625255 has 16 divisors (see below), whose sum is σ = 304640455680. Its totient is φ = 199483318272.

The previous prime is 251605625209. The next prime is 251605625263. The reversal of 251605625255 is 552526506152.

It is a cyclic number.

It is not a de Polignac number, because 251605625255 - 2²⁶ = 251538516391 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243815 + ... + 750104.

It is an arithmetic number, because the mean of its divisors is an integer number (19040028480).

Almost surely, 2^251605625255 is an apocalyptic number.

251605625255 is a deficient number, since it is larger than the sum of its proper divisors (53034830425).

251605625255 is a wasteful number, since it uses less digits than its factorization.

251605625255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994378.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 251605625255 in words is "two hundred fifty-one billion, six hundred five million, six hundred twenty-five thousand, two hundred fifty-five".