138877481864431 has 4 divisors (see below), whose sum is σ = 140106486128832. Its totient is φ = 137648477600032.

The previous prime is 138877481864419. The next prime is 138877481864477. The reversal of 138877481864431 is 134468184778831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138877481864431 - 2²⁷ = 138877347646703 is a prime.

It is a super-2 number, since 2×138877481864431² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138877482864431) 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, 614502132031 + ... + 614502132256.

It is an arithmetic number, because the mean of its divisors is an integer number (35026621532208).

Almost surely, 2^{138877481864431} is an apocalyptic number.

138877481864431 is a deficient number, since it is larger than the sum of its proper divisors (1229004264401).

138877481864431 is a wasteful number, since it uses less digits than its factorization.

138877481864431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229004264400.

The product of its digits is 693633024, while the sum is 73.

The spelling of 138877481864431 in words is "one hundred thirty-eight trillion, eight hundred seventy-seven billion, four hundred eighty-one million, eight hundred sixty-four thousand, four hundred thirty-one".