138107990505 has 16 divisors (see below), whose sum is σ = 221018926464. Its totient is φ = 73642214400.

The previous prime is 138107990491. The next prime is 138107990507. The reversal of 138107990505 is 505099701831.

It is not a de Polignac number, because 138107990505 - 2⁹ = 138107989993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138107990507) by changing a digit.

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, 886869 + ... + 1030898.

It is an arithmetic number, because the mean of its divisors is an integer number (13813682904).

Almost surely, 2^138107990505 is an apocalyptic number.

138107990505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138107990505 is a deficient number, since it is larger than the sum of its proper divisors (82910935959).

138107990505 is a wasteful number, since it uses less digits than its factorization.

138107990505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922576.

The product of its (nonzero) digits is 340200, while the sum is 48.

The spelling of 138107990505 in words is "one hundred thirty-eight billion, one hundred seven million, nine hundred ninety thousand, five hundred five".