138878754015 has 8 divisors (see below), whose sum is σ = 222206006448. Its totient is φ = 74068668800.

The previous prime is 138878753999. The next prime is 138878754089. The reversal of 138878754015 is 510457878831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138878754015 - 2⁴ = 138878753999 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4629291786 + ... + 4629291815.

It is an arithmetic number, because the mean of its divisors is an integer number (27775750806).

Almost surely, 2^138878754015 is an apocalyptic number.

138878754015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138878754015 is a deficient number, since it is larger than the sum of its proper divisors (83327252433).

138878754015 is an equidigital number, since it uses as much as digits as its factorization.

138878754015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9258583609.

The product of its (nonzero) digits is 7526400, while the sum is 57.

The spelling of 138878754015 in words is "one hundred thirty-eight billion, eight hundred seventy-eight million, seven hundred fifty-four thousand, fifteen".