83990977138 has 16 divisors (see below), whose sum is σ = 136651032504. Its totient is φ = 38561136640.

The previous prime is 83990977127. The next prime is 83990977141. The reversal of 83990977138 is 83177909938.

It can be written as a sum of positive squares in 4 ways, for example, as 31551351129 + 52439626009 = 177627^2 + 228997^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 83990977138.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30124495 + ... + 30127282.

Almost surely, 2^83990977138 is an apocalyptic number.

83990977138 is a deficient number, since it is larger than the sum of its proper divisors (52660055366).

83990977138 is a wasteful number, since it uses less digits than its factorization.

83990977138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60251837.

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 83990977138 in words is "eighty-three billion, nine hundred ninety million, nine hundred seventy-seven thousand, one hundred thirty-eight".