16653992666 has 4 divisors (see below), whose sum is σ = 24980989002. Its totient is φ = 8326996332.

The previous prime is 16653992627. The next prime is 16653992699. The reversal of 16653992666 is 66629935661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11241300625 + 5412692041 = 106025^2 + 73571^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4163498165 + ... + 4163498168.

Almost surely, 2^16653992666 is an apocalyptic number.

16653992666 is a deficient number, since it is larger than the sum of its proper divisors (8326996336).

16653992666 is an equidigital number, since it uses as much as digits as its factorization.

16653992666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8326996335.

The product of its digits is 18895680, while the sum is 59.

The spelling of 16653992666 in words is "sixteen billion, six hundred fifty-three million, nine hundred ninety-two thousand, six hundred sixty-six".