138992888905 has 16 divisors (see below), whose sum is σ = 184476219984. Its totient is φ = 99866822400.

The previous prime is 138992888897. The next prime is 138992889097. The reversal of 138992888905 is 509888299831.

It can be written as a sum of positive squares in 8 ways, for example, as 23803244089 + 115189644816 = 154283^2 + 339396^2 .

It is not a de Polignac number, because 138992888905 - 2³ = 138992888897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28894246 + ... + 28899055.

It is an arithmetic number, because the mean of its divisors is an integer number (11529763749).

Almost surely, 2^138992888905 is an apocalyptic number.

It is an amenable number.

138992888905 is a deficient number, since it is larger than the sum of its proper divisors (45483331079).

138992888905 is a wasteful number, since it uses less digits than its factorization.

138992888905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57793356.

The product of its (nonzero) digits is 89579520, while the sum is 70.

The spelling of 138992888905 in words is "one hundred thirty-eight billion, nine hundred ninety-two million, eight hundred eighty-eight thousand, nine hundred five".