51500016120 has 64 divisors (see below), whose sum is σ = 176571486720. Its totient is φ = 11771432064.

The previous prime is 51500016109. The next prime is 51500016179. The reversal of 51500016120 is 2161000515.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 15 ways as a sum of consecutive naturals, for example, 30653932 + ... + 30655611.

It is an arithmetic number, because the mean of its divisors is an integer number (2758929480).

Almost surely, 2^51500016120 is an apocalyptic number.

It is an amenable number.

51500016120 is an abundant number, since it is smaller than the sum of its proper divisors (125071470600).

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

51500016120 is a wasteful number, since it uses less digits than its factorization.

51500016120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61309564 (or 61309560 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 51500016120 its reverse (2161000515), we get a palindrome (53661016635).

The spelling of 51500016120 in words is "fifty-one billion, five hundred million, sixteen thousand, one hundred twenty".