16566997572 has 18 divisors (see below), whose sum is σ = 41877688398. Its totient is φ = 5522332512.

The previous prime is 16566997529. The next prime is 16566997583. The reversal of 16566997572 is 27579966561.

16566997572 is a `hidden beast` number, since 1 + 6 + 56 + 6 + 9 + 9 + 7 + 572 = 666.

16566997572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12289052736 + 4277944836 = 110856^2 + 65406^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 230097153 + ... + 230097224.

Almost surely, 2^16566997572 is an apocalyptic number.

16566997572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16566997572 is an abundant number, since it is smaller than the sum of its proper divisors (25310690826).

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

16566997572 is a wasteful number, since it uses less digits than its factorization.

16566997572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460194387 (or 460194382 counting only the distinct ones).

The product of its digits is 42865200, while the sum is 63.

The spelling of 16566997572 in words is "sixteen billion, five hundred sixty-six million, nine hundred ninety-seven thousand, five hundred seventy-two".