15331284857987 has 32 divisors (see below), whose sum is σ = 18170229043200. Its totient is φ = 12656796300288.

The previous prime is 15331284857957. The next prime is 15331284858041. The reversal of 15331284857987 is 78975848213351.

It is not a de Polignac number, because 15331284857987 - 2⁸ = 15331284857731 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15331284857987.

It is not an unprimeable number, because it can be changed into a prime (15331284857957) 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, 141893138 + ... + 142001144.

It is an arithmetic number, because the mean of its divisors is an integer number (567819657600).

Almost surely, 2^{15331284857987} is an apocalyptic number.

15331284857987 is a deficient number, since it is larger than the sum of its proper divisors (2838944185213).

15331284857987 is a wasteful number, since it uses less digits than its factorization.

15331284857987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109755.

The product of its digits is 406425600, while the sum is 71.

The spelling of 15331284857987 in words is "fifteen trillion, three hundred thirty-one billion, two hundred eighty-four million, eight hundred fifty-seven thousand, nine hundred eighty-seven".