51305504520 has 32 divisors (see below), whose sum is σ = 153916513920. Its totient is φ = 13681467840.

The previous prime is 51305504443. The next prime is 51305504531. The reversal of 51305504520 is 2540550315.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213772816 + ... + 213773055.

It is an arithmetic number, because the mean of its divisors is an integer number (4809891060).

Almost surely, 2^51305504520 is an apocalyptic number.

It is an amenable number.

51305504520 is an abundant number, since it is smaller than the sum of its proper divisors (102611009400).

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

51305504520 is a wasteful number, since it uses less digits than its factorization.

51305504520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427545885 (or 427545881 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The spelling of 51305504520 in words is "fifty-one billion, three hundred five million, five hundred four thousand, five hundred twenty".