51520551525 has 96 divisors (see below), whose sum is σ = 102841036800. Its totient is φ = 25191518400.

The previous prime is 51520551491. The next prime is 51520551557. The reversal of 51520551525 is 52515502515.

51520551525 is a `hidden beast` number, since 5 + 1 + 52 + 0 + 551 + 52 + 5 = 666.

It is not a de Polignac number, because 51520551525 - 2¹¹ = 51520549477 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51520551525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 332782 + ... + 462368.

It is an arithmetic number, because the mean of its divisors is an integer number (1071260800).

Almost surely, 2^51520551525 is an apocalyptic number.

It is an amenable number.

51520551525 is a deficient number, since it is larger than the sum of its proper divisors (51320485275).

51520551525 is a wasteful number, since it uses less digits than its factorization.

51520551525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129656 (or 129645 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 36.

The spelling of 51520551525 in words is "fifty-one billion, five hundred twenty million, five hundred fifty-one thousand, five hundred twenty-five".