15956316987 has 16 divisors (see below), whose sum is σ = 23287238688. Its totient is φ = 9658298880.

The previous prime is 15956316973. The next prime is 15956316991. The reversal of 15956316987 is 78961365951.

It is not a de Polignac number, because 15956316987 - 2²⁷ = 15822099259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15956316987.

It is not an unprimeable number, because it can be changed into a prime (15956316917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3351198 + ... + 3355955.

It is an arithmetic number, because the mean of its divisors is an integer number (1455452418).

Almost surely, 2^15956316987 is an apocalyptic number.

15956316987 is a deficient number, since it is larger than the sum of its proper divisors (7330921701).

15956316987 is a wasteful number, since it uses less digits than its factorization.

15956316987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707230.

The product of its digits is 12247200, while the sum is 60.

The spelling of 15956316987 in words is "fifteen billion, nine hundred fifty-six million, three hundred sixteen thousand, nine hundred eighty-seven".