15871444616664 has 96 divisors (see below), whose sum is σ = 52904815410720. Its totient is φ = 4185875501568.

The previous prime is 15871444616663. The next prime is 15871444616711. The reversal of 15871444616664 is 46661644417851.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15871444616663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1211184277 + ... + 1211197380.

It is an arithmetic number, because the mean of its divisors is an integer number (551091827195).

Almost surely, 2^{15871444616664} is an apocalyptic number.

15871444616664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

15871444616664 is an abundant number, since it is smaller than the sum of its proper divisors (37033370794056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15871444616664 is a wasteful number, since it uses less digits than its factorization.

15871444616664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422381689 (or 2422381682 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 63.

The spelling of 15871444616664 in words is "fifteen trillion, eight hundred seventy-one billion, four hundred forty-four million, six hundred sixteen thousand, six hundred sixty-four".