51234520520 has 32 divisors (see below), whose sum is σ = 115448009400. Its totient is φ = 20463525888.

The previous prime is 51234520489. The next prime is 51234520543. The reversal of 51234520520 is 2502543215.

It can be written as a sum of positive squares in 4 ways, for example, as 50966674564 + 267845956 = 225758^2 + 16366^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 918905 + ... + 973064.

Almost surely, 2^51234520520 is an apocalyptic number.

It is an amenable number.

51234520520 is an abundant number, since it is smaller than the sum of its proper divisors (64213488880).

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

51234520520 is a wasteful number, since it uses less digits than its factorization.

51234520520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892657 (or 1892653 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The spelling of 51234520520 in words is "fifty-one billion, two hundred thirty-four million, five hundred twenty thousand, five hundred twenty".