16615566516 has 12 divisors (see below), whose sum is σ = 38769655232. Its totient is φ = 5538522168.

The previous prime is 16615566509. The next prime is 16615566521. The reversal of 16615566516 is 61566551661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 692315260 + ... + 692315283.

Almost surely, 2^16615566516 is an apocalyptic number.

It is an amenable number.

16615566516 is an abundant number, since it is smaller than the sum of its proper divisors (22154088716).

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

16615566516 is a wasteful number, since it uses less digits than its factorization.

16615566516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384630550 (or 1384630548 counting only the distinct ones).

The product of its digits is 972000, while the sum is 48.

The spelling of 16615566516 in words is "sixteen billion, six hundred fifteen million, five hundred sixty-six thousand, five hundred sixteen".