251520325616 has 40 divisors (see below), whose sum is σ = 556965494784. Its totient is φ = 107789077440.

The previous prime is 251520325597. The next prime is 251520325631. The reversal of 251520325616 is 616523025152.

It is a self number, because there is not a number n which added to its sum of digits gives 251520325616.

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, 2916881 + ... + 3001871.

Almost surely, 2^251520325616 is an apocalyptic number.

It is an amenable number.

251520325616 is an abundant number, since it is smaller than the sum of its proper divisors (305445169168).

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

251520325616 is a wasteful number, since it uses less digits than its factorization.

251520325616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111429 (or 111423 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 251520325616 in words is "two hundred fifty-one billion, five hundred twenty million, three hundred twenty-five thousand, six hundred sixteen".