51872272418 has 6 divisors (see below), whose sum is σ = 77808891771. Its totient is φ = 25935975162.

The previous prime is 51872272411. The next prime is 51872272427. The reversal of 51872272418 is 81427227815.

It can be written as a sum of positive squares in only one way, i.e., 25936136209 + 25936136209 = 161047^2 + 161047^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=161047.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51872272411) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 241571 + ... + 402617.

Almost surely, 2^51872272418 is an apocalyptic number.

51872272418 is a deficient number, since it is larger than the sum of its proper divisors (25936619353).

51872272418 is an frugal number, since it uses more digits than its factorization.

51872272418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322096 (or 161049 counting only the distinct ones).

The product of its digits is 501760, while the sum is 47.

The spelling of 51872272418 in words is "fifty-one billion, eight hundred seventy-two million, two hundred seventy-two thousand, four hundred eighteen".