7138878131715 has 32 divisors (see below), whose sum is σ = 13116407673600. Its totient is φ = 3279101915520.

The previous prime is 7138878131701. The next prime is 7138878131717. The reversal of 7138878131715 is 5171318788317.

It is a happy number.

It is not a de Polignac number, because 7138878131715 - 2⁷ = 7138878131587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7138878131717) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1138573920 + ... + 1138580189.

It is an arithmetic number, because the mean of its divisors is an integer number (409887739800).

Almost surely, 2^{7138878131715} is an apocalyptic number.

7138878131715 is a deficient number, since it is larger than the sum of its proper divisors (5977529541885).

7138878131715 is a wasteful number, since it uses less digits than its factorization.

7138878131715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277154147.

The product of its digits is 7902720, while the sum is 60.

The spelling of 7138878131715 in words is "seven trillion, one hundred thirty-eight billion, eight hundred seventy-eight million, one hundred thirty-one thousand, seven hundred fifteen".