16663972 has 24 divisors (see below), whose sum is σ = 31880576. Its totient is φ = 7574688.

The previous prime is 16663963. The next prime is 16663987. The reversal of 16663972 is 27936661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093 + ... + 5875.

Almost surely, 2^16663972 is an apocalyptic number.

It is an amenable number.

16663972 is a deficient number, since it is larger than the sum of its proper divisors (15216604).

16663972 is a wasteful number, since it uses less digits than its factorization.

16663972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4867 (or 4865 counting only the distinct ones).

The product of its digits is 81648, while the sum is 40.

The square root of 16663972 is about 4082.1528633798. The cubic root of 16663972 is about 255.4227103993.

The spelling of 16663972 in words is "sixteen million, six hundred sixty-three thousand, nine hundred seventy-two".