251651124216 has 32 divisors (see below), whose sum is σ = 699030901200. Its totient is φ = 83883708000.

The previous prime is 251651124167. The next prime is 251651124229. The reversal of 251651124216 is 612421156152.

251651124216 is a `hidden beast` number, since 2 + 516 + 5 + 1 + 124 + 2 + 16 = 666.

It is a super-2 number, since 2×251651124216² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 7 ways as a sum of consecutive naturals, for example, 582525535 + ... + 582525966.

Almost surely, 2^251651124216 is an apocalyptic number.

It is an amenable number.

251651124216 is an abundant number, since it is smaller than the sum of its proper divisors (447379776984).

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

251651124216 is a wasteful number, since it uses less digits than its factorization.

251651124216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165051516 (or 1165051506 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The spelling of 251651124216 in words is "two hundred fifty-one billion, six hundred fifty-one million, one hundred twenty-four thousand, two hundred sixteen".