16566531518 has 16 divisors (see below), whose sum is σ = 26871372864. Its totient is φ = 7630141440.

The previous prime is 16566531481. The next prime is 16566531539. The reversal of 16566531518 is 81513566561.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5181923 + ... + 5185118.

It is an arithmetic number, because the mean of its divisors is an integer number (1679460804).

Almost surely, 2^16566531518 is an apocalyptic number.

16566531518 is a deficient number, since it is larger than the sum of its proper divisors (10304841346).

16566531518 is a wasteful number, since it uses less digits than its factorization.

16566531518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10367107.

The product of its digits is 648000, while the sum is 47.

The spelling of 16566531518 in words is "sixteen billion, five hundred sixty-six million, five hundred thirty-one thousand, five hundred eighteen".