138459358899621 has 6 divisors (see below), whose sum is σ = 199996851743910. Its totient is φ = 92306239266408.

The previous prime is 138459358899557. The next prime is 138459358899623. The reversal of 138459358899621 is 126998853954831.

138459358899621 is a `hidden beast` number, since 1 + 3 + 8 + 4 + 5 + 9 + 3 + 588 + 9 + 9 + 6 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 78844436954721 + 59614921944900 = 8879439^2 + 7721070^2 .

It is not a de Polignac number, because 138459358899621 - 2⁶ = 138459358899557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138459358899623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7692186605526 + ... + 7692186605543.

It is an arithmetic number, because the mean of its divisors is an integer number (33332808623985).

Almost surely, 2^{138459358899621} is an apocalyptic number.

It is an amenable number.

138459358899621 is a deficient number, since it is larger than the sum of its proper divisors (61537492844289).

138459358899621 is a wasteful number, since it uses less digits than its factorization.

138459358899621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15384373211075 (or 15384373211072 counting only the distinct ones).

The product of its digits is 4031078400, while the sum is 81.

The spelling of 138459358899621 in words is "one hundred thirty-eight trillion, four hundred fifty-nine billion, three hundred fifty-eight million, eight hundred ninety-nine thousand, six hundred twenty-one".