15854864523816 has 64 divisors (see below), whose sum is σ = 40786002270720. Its totient is φ = 5132932116480.

The previous prime is 15854864523749. The next prime is 15854864523821. The reversal of 15854864523816 is 61832546845851.

It is a happy number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 35907625 + ... + 36346488.

It is an arithmetic number, because the mean of its divisors is an integer number (637281285480).

Almost surely, 2^{15854864523816} is an apocalyptic number.

It is an amenable number.

15854864523816 is an abundant number, since it is smaller than the sum of its proper divisors (24931137746904).

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

15854864523816 is a wasteful number, since it uses less digits than its factorization.

15854864523816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72254386 (or 72254382 counting only the distinct ones).

The product of its digits is 221184000, while the sum is 66.

The spelling of 15854864523816 in words is "fifteen trillion, eight hundred fifty-four billion, eight hundred sixty-four million, five hundred twenty-three thousand, eight hundred sixteen".