53139956018 has 6 divisors (see below), whose sum is σ = 79710423039. Its totient is φ = 26569815006.

The previous prime is 53139956017. The next prime is 53139956053. The reversal of 53139956018 is 81065993135.

53139956018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 26569978009 + 26569978009 = 163003^2 + 163003^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=163003.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53139956011) 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, 244505 + ... + 407507.

Almost surely, 2^53139956018 is an apocalyptic number.

53139956018 is a deficient number, since it is larger than the sum of its proper divisors (26570467021).

53139956018 is an frugal number, since it uses more digits than its factorization.

53139956018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326008 (or 163005 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 50.

Multiplying 53139956018 by its sum of digits (50), we get a square (2656997800900 = 1630030²).

The spelling of 53139956018 in words is "fifty-three billion, one hundred thirty-nine million, nine hundred fifty-six thousand, eighteen".