138866961644 has 12 divisors (see below), whose sum is σ = 247136118600. Its totient is φ = 68256642048.

The previous prime is 138866961641. The next prime is 138866961647. The reversal of 138866961644 is 446169668831.

It is an interprime number because it is at equal distance from previous prime (138866961641) and next prime (138866961647).

It is not an unprimeable number, because it can be changed into a prime (138866961641) 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, 294209429 + ... + 294209900.

It is an arithmetic number, because the mean of its divisors is an integer number (20594676550).

Almost surely, 2^138866961644 is an apocalyptic number.

It is an amenable number.

138866961644 is a deficient number, since it is larger than the sum of its proper divisors (108269156956).

138866961644 is a wasteful number, since it uses less digits than its factorization.

138866961644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588419392 (or 588419390 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 62.

The spelling of 138866961644 in words is "one hundred thirty-eight billion, eight hundred sixty-six million, nine hundred sixty-one thousand, six hundred forty-four".