251425402551 has 12 divisors (see below), whose sum is σ = 363186133128. Its totient is φ = 167609500944.

The previous prime is 251425402477. The next prime is 251425402577. The reversal of 251425402551 is 155204524152.

251425402551 is a `hidden beast` number, since 2 + 5 + 1 + 42 + 540 + 25 + 51 = 666.

It is not a de Polignac number, because 251425402551 - 2¹⁰ = 251425401527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251425402051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 401265 + ... + 814778.

It is an arithmetic number, because the mean of its divisors is an integer number (30265511094).

Almost surely, 2^251425402551 is an apocalyptic number.

251425402551 is a deficient number, since it is larger than the sum of its proper divisors (111760730577).

251425402551 is a wasteful number, since it uses less digits than its factorization.

251425402551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239022 (or 1239019 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

The spelling of 251425402551 in words is "two hundred fifty-one billion, four hundred twenty-five million, four hundred two thousand, five hundred fifty-one".