138788777765 has 32 divisors (see below), whose sum is σ = 187422111360. Its totient is φ = 97800595200.

The previous prime is 138788777759. The next prime is 138788777783. The reversal of 138788777765 is 567777887831.

It is not a de Polignac number, because 138788777765 - 2⁴ = 138788777749 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138788777692 and 138788777701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83930 + ... + 533499.

It is an arithmetic number, because the mean of its divisors is an integer number (5856940980).

Almost surely, 2^138788777765 is an apocalyptic number.

It is an amenable number.

138788777765 is a deficient number, since it is larger than the sum of its proper divisors (48633333595).

138788777765 is a wasteful number, since it uses less digits than its factorization.

138788777765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617573.

The product of its digits is 774466560, while the sum is 74.

The spelling of 138788777765 in words is "one hundred thirty-eight billion, seven hundred eighty-eight million, seven hundred seventy-seven thousand, seven hundred sixty-five".