15987087113663 has 4 divisors (see below), whose sum is σ = 16927504002720. Its totient is φ = 15046670224608.

The previous prime is 15987087113617. The next prime is 15987087113671. The reversal of 15987087113663 is 36631178078951.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15987087113663 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 15987087113663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15987087113563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470208444503 + ... + 470208444536.

It is an arithmetic number, because the mean of its divisors is an integer number (4231876000680).

Almost surely, 2^{15987087113663} is an apocalyptic number.

15987087113663 is a deficient number, since it is larger than the sum of its proper divisors (940416889057).

15987087113663 is an equidigital number, since it uses as much as digits as its factorization.

15987087113663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940416889056.

The product of its (nonzero) digits is 45722880, while the sum is 65.

The spelling of 15987087113663 in words is "fifteen trillion, nine hundred eighty-seven billion, eighty-seven million, one hundred thirteen thousand, six hundred sixty-three".