138650979971 has 32 divisors (see below), whose sum is σ = 170063981568. Its totient is φ = 110443132800.

The previous prime is 138650979947. The next prime is 138650979991. The reversal of 138650979971 is 179979056831.

It is not a de Polignac number, because 138650979971 - 2¹⁴ = 138650963587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138650979898 and 138650979907.

It is not an unprimeable number, because it can be changed into a prime (138650979911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4159256 + ... + 4192458.

It is an arithmetic number, because the mean of its divisors is an integer number (5314499424).

Almost surely, 2^138650979971 is an apocalyptic number.

138650979971 is a deficient number, since it is larger than the sum of its proper divisors (31413001597).

138650979971 is a wasteful number, since it uses less digits than its factorization.

138650979971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33971.

The product of its (nonzero) digits is 25719120, while the sum is 65.

The spelling of 138650979971 in words is "one hundred thirty-eight billion, six hundred fifty million, nine hundred seventy-nine thousand, nine hundred seventy-one".