16566531516 has 36 divisors (see below), whose sum is σ = 41881114912. Its totient is φ = 5521569984.

The previous prime is 16566531481. The next prime is 16566531539. The reversal of 16566531516 is 61513566561.

16566531516 is a `hidden beast` number, since 1 + 6 + 5 + 66 + 531 + 51 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 408576 + ... + 447288.

Almost surely, 2^16566531516 is an apocalyptic number.

It is an amenable number.

16566531516 is an abundant number, since it is smaller than the sum of its proper divisors (25314583396).

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

16566531516 is a wasteful number, since it uses less digits than its factorization.

16566531516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50610 (or 50605 counting only the distinct ones).

The product of its digits is 486000, while the sum is 45.

The spelling of 16566531516 in words is "sixteen billion, five hundred sixty-six million, five hundred thirty-one thousand, five hundred sixteen".