138775262639 has 4 divisors (see below), whose sum is σ = 149450282856. Its totient is φ = 128100242424.

The previous prime is 138775262621. The next prime is 138775262651. The reversal of 138775262639 is 936262577831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936262577831 = 7 ⋅133751796833.

It is a cyclic number.

It is not a de Polignac number, because 138775262639 - 2¹² = 138775258543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138775262539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5337510089 + ... + 5337510114.

It is an arithmetic number, because the mean of its divisors is an integer number (37362570714).

Almost surely, 2^138775262639 is an apocalyptic number.

138775262639 is a deficient number, since it is larger than the sum of its proper divisors (10675020217).

138775262639 is a wasteful number, since it uses less digits than its factorization.

138775262639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10675020216.

The product of its digits is 22861440, while the sum is 59.

The spelling of 138775262639 in words is "one hundred thirty-eight billion, seven hundred seventy-five million, two hundred sixty-two thousand, six hundred thirty-nine".