51572515122 has 18 divisors (see below), whose sum is σ = 111742537023. Its totient is φ = 17190517212.

The previous prime is 51572515109. The next prime is 51572515123. The reversal of 51572515122 is 22151527515.

51572515122 is a `hidden beast` number, since 5 + 15 + 7 + 2 + 515 + 122 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25786257561 + 25786257561 = 160581^2 + 160581^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=160581.

It is not an unprimeable number, because it can be changed into a prime (51572515123) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 936723 + ... + 990249.

Almost surely, 2^51572515122 is an apocalyptic number.

51572515122 is an abundant number, since it is smaller than the sum of its proper divisors (60170021901).

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

51572515122 is an frugal number, since it uses more digits than its factorization.

51572515122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107062 (or 53532 counting only the distinct ones).

The product of its digits is 35000, while the sum is 36.

The spelling of 51572515122 in words is "fifty-one billion, five hundred seventy-two million, five hundred fifteen thousand, one hundred twenty-two".