15642938874787 has 32 divisors (see below), whose sum is σ = 18844618673664. Its totient is φ = 12703316832000.

The previous prime is 15642938874781. The next prime is 15642938874811. The reversal of 15642938874787 is 78747883924651.

It is a cyclic number.

It is not a de Polignac number, because 15642938874787 - 2²³ = 15642930486179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15642938874781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4145412 + ... + 6962062.

It is an arithmetic number, because the mean of its divisors is an integer number (588894333552).

Almost surely, 2^{15642938874787} is an apocalyptic number.

15642938874787 is a deficient number, since it is larger than the sum of its proper divisors (3201679798877).

15642938874787 is a wasteful number, since it uses less digits than its factorization.

15642938874787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817259.

The product of its digits is 4551966720, while the sum is 79.

The spelling of 15642938874787 in words is "fifteen trillion, six hundred forty-two billion, nine hundred thirty-eight million, eight hundred seventy-four thousand, seven hundred eighty-seven".