65687634438 has 24 divisors (see below), whose sum is σ = 137335590168. Its totient is φ = 20943882432.

The previous prime is 65687634413. The next prime is 65687634469. The reversal of 65687634438 is 83443678656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10344595 + ... + 10350942.

It is an arithmetic number, because the mean of its divisors is an integer number (5722316257).

Almost surely, 2^65687634438 is an apocalyptic number.

65687634438 is an abundant number, since it is smaller than the sum of its proper divisors (71647955730).

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

65687634438 is a wasteful number, since it uses less digits than its factorization.

65687634438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20695588 (or 20695565 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 60.

The spelling of 65687634438 in words is "sixty-five billion, six hundred eighty-seven million, six hundred thirty-four thousand, four hundred thirty-eight".