138776665 has 16 divisors (see below), whose sum is σ = 179032320. Its totient is φ = 102936960.

The previous prime is 138776657. The next prime is 138776681. The reversal of 138776665 is 566677831.

It is not a de Polignac number, because 138776665 - 2³ = 138776657 is a prime.

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, 11076 + ... + 20005.

It is an arithmetic number, because the mean of its divisors is an integer number (11189520).

Almost surely, 2^138776665 is an apocalyptic number.

It is an amenable number.

138776665 is a deficient number, since it is larger than the sum of its proper divisors (40255655).

138776665 is a wasteful number, since it uses less digits than its factorization.

138776665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31152.

The product of its digits is 1270080, while the sum is 49.

The square root of 138776665 is about 11780.3508012283. The cubic root of 138776665 is about 517.7325644548.

It can be divided in two parts, 1387766 and 65, that added together give a palindrome (1387831).

The spelling of 138776665 in words is "one hundred thirty-eight million, seven hundred seventy-six thousand, six hundred sixty-five".