138913778785 has 16 divisors (see below), whose sum is σ = 179550740160. Its totient is φ = 102833599680.

The previous prime is 138913778779. The next prime is 138913778851. The reversal of 138913778785 is 587877319831.

It is not a de Polignac number, because 138913778785 - 2²¹ = 138911681633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138913778785.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16998826 + ... + 17006995.

It is an arithmetic number, because the mean of its divisors is an integer number (11221921260).

Almost surely, 2^138913778785 is an apocalyptic number.

It is an amenable number.

138913778785 is a deficient number, since it is larger than the sum of its proper divisors (40636961375).

138913778785 is a wasteful number, since it uses less digits than its factorization.

138913778785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34005888.

The product of its digits is 71124480, while the sum is 67.

The spelling of 138913778785 in words is "one hundred thirty-eight billion, nine hundred thirteen million, seven hundred seventy-eight thousand, seven hundred eighty-five".