138949279616 has 48 divisors (see below), whose sum is σ = 322006994640. Its totient is φ = 59549688576.

The previous prime is 138949279607. The next prime is 138949279619. The reversal of 138949279616 is 616972949831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138949279619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11070680 + ... + 11083223.

It is an arithmetic number, because the mean of its divisors is an integer number (6708479055).

Almost surely, 2^138949279616 is an apocalyptic number.

138949279616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138949279616 is an abundant number, since it is smaller than the sum of its proper divisors (183057715024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138949279616 is an equidigital number, since it uses as much as digits as its factorization.

138949279616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22153931 (or 22153912 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 65.

The spelling of 138949279616 in words is "one hundred thirty-eight billion, nine hundred forty-nine million, two hundred seventy-nine thousand, six hundred sixteen".