51520071504 has 160 divisors (see below), whose sum is σ = 146224641024. Its totient is φ = 15501680640.

The previous prime is 51520071467. The next prime is 51520071523. The reversal of 51520071504 is 40517002515.

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 31 ways as a sum of consecutive naturals, for example, 80124207 + ... + 80124849.

Almost surely, 2^51520071504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51520071504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73112320512).

51520071504 is an abundant number, since it is smaller than the sum of its proper divisors (94704569520).

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

51520071504 is a wasteful number, since it uses less digits than its factorization.

51520071504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505 (or 1499 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 30.

The spelling of 51520071504 in words is "fifty-one billion, five hundred twenty million, seventy-one thousand, five hundred four".