138179781927 has 32 divisors (see below), whose sum is σ = 223361656320. Its totient is φ = 83730024000.

The previous prime is 138179781923. The next prime is 138179781959. The reversal of 138179781927 is 729187971831.

138179781927 is a `hidden beast` number, since 1 + 381 + 7 + 97 + 81 + 92 + 7 = 666.

It is not a de Polignac number, because 138179781927 - 2² = 138179781923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138179781923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1707102 + ... + 1786212.

It is an arithmetic number, because the mean of its divisors is an integer number (6980051760).

Almost surely, 2^138179781927 is an apocalyptic number.

138179781927 is a deficient number, since it is larger than the sum of its proper divisors (85181874393).

138179781927 is a wasteful number, since it uses less digits than its factorization.

138179781927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85012 (or 85006 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 63.

The spelling of 138179781927 in words is "one hundred thirty-eight billion, one hundred seventy-nine million, seven hundred eighty-one thousand, nine hundred twenty-seven".