138189625821 has 48 divisors (see below), whose sum is σ = 215716737600. Its totient is φ = 84741615360.

The previous prime is 138189625813. The next prime is 138189625841. The reversal of 138189625821 is 128526981831.

138189625821 is a `hidden beast` number, since 1 + 3 + 8 + 1 + 8 + 9 + 625 + 8 + 2 + 1 = 666.

It is not a de Polignac number, because 138189625821 - 2³ = 138189625813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138189625801) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57315106 + ... + 57317516.

It is an arithmetic number, because the mean of its divisors is an integer number (4494098700).

Almost surely, 2^138189625821 is an apocalyptic number.

It is an amenable number.

138189625821 is a deficient number, since it is larger than the sum of its proper divisors (77527111779).

138189625821 is a wasteful number, since it uses less digits than its factorization.

138189625821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3946 (or 3943 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The spelling of 138189625821 in words is "one hundred thirty-eight billion, one hundred eighty-nine million, six hundred twenty-five thousand, eight hundred twenty-one".