51505023120 has 80 divisors (see below), whose sum is σ = 165171303360. Its totient is φ = 13261061632.

The previous prime is 51505023109. The next prime is 51505023121. The reversal of 51505023120 is 2132050515.

It is a happy number.

51505023120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (51505023121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3693114 + ... + 3707033.

It is an arithmetic number, because the mean of its divisors is an integer number (2064641292).

Almost surely, 2^51505023120 is an apocalyptic number.

It is an amenable number.

51505023120 is an abundant number, since it is smaller than the sum of its proper divisors (113666280240).

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

51505023120 is a wasteful number, since it uses less digits than its factorization.

51505023120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7400192 (or 7400186 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

Adding to 51505023120 its reverse (2132050515), we get a palindrome (53637073635).

The spelling of 51505023120 in words is "fifty-one billion, five hundred five million, twenty-three thousand, one hundred twenty".