138081338385 has 16 divisors (see below), whose sum is σ = 221442750720. Its totient is φ = 73472510720.

The previous prime is 138081338347. The next prime is 138081338401. The reversal of 138081338385 is 583833180831.

It is a happy number.

It is not a de Polignac number, because 138081338385 - 2¹³ = 138081330193 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10672680 + ... + 10685609.

It is an arithmetic number, because the mean of its divisors is an integer number (13840171920).

Almost surely, 2^138081338385 is an apocalyptic number.

138081338385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138081338385 is a deficient number, since it is larger than the sum of its proper divisors (83361412335).

138081338385 is a wasteful number, since it uses less digits than its factorization.

138081338385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21358728.

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 138081338385 in words is "one hundred thirty-eight billion, eighty-one million, three hundred thirty-eight thousand, three hundred eighty-five".