138013679647 has 4 divisors (see below), whose sum is σ = 138015268240. Its totient is φ = 138012091056.

The previous prime is 138013679627. The next prime is 138013679677. The reversal of 138013679647 is 746976310831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746976310831 = 197 ⋅3791757923.

It is a cyclic number.

It is not a de Polignac number, because 138013679647 - 2¹⁵ = 138013646879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138013679627) 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, 655947 + ... + 840412.

It is an arithmetic number, because the mean of its divisors is an integer number (34503817060).

Almost surely, 2^138013679647 is an apocalyptic number.

138013679647 is a deficient number, since it is larger than the sum of its proper divisors (1588593).

138013679647 is an equidigital number, since it uses as much as digits as its factorization.

138013679647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588592.

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 138013679647 in words is "one hundred thirty-eight billion, thirteen million, six hundred seventy-nine thousand, six hundred forty-seven".