138881364651 has 12 divisors (see below), whose sum is σ = 207077590720. Its totient is φ = 89600880240.

The previous prime is 138881364649. The next prime is 138881364707. The reversal of 138881364651 is 156463188831.

It is a happy number.

It is not a de Polignac number, because 138881364651 - 2¹ = 138881364649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138881364451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 248891056 + ... + 248891613.

Almost surely, 2^138881364651 is an apocalyptic number.

138881364651 is a deficient number, since it is larger than the sum of its proper divisors (68196226069).

138881364651 is a wasteful number, since it uses less digits than its factorization.

138881364651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497782706 (or 497782703 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The spelling of 138881364651 in words is "one hundred thirty-eight billion, eight hundred eighty-one million, three hundred sixty-four thousand, six hundred fifty-one".