63109807538 has 18 divisors (see below), whose sum is σ = 97312635063. Its totient is φ = 30695673600.

The previous prime is 63109807507. The next prime is 63109807543. The reversal of 63109807538 is 83570890136.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 59176887169 + 3932920369 = 243263^2 + 62713^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=177637.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13142738 + ... + 13147538.

Almost surely, 2^63109807538 is an apocalyptic number.

63109807538 is a deficient number, since it is larger than the sum of its proper divisors (34202827525).

63109807538 is an frugal number, since it uses more digits than its factorization.

63109807538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9678 (or 4840 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

Multiplying 63109807538 by its sum of digits (50), we get a square (3155490376900 = 1776370²).

The spelling of 63109807538 in words is "sixty-three billion, one hundred nine million, eight hundred seven thousand, five hundred thirty-eight".