16556664 has 32 divisors (see below), whose sum is σ = 41778000. Its totient is φ = 5467392.

The previous prime is 16556663. The next prime is 16556671. The reversal of 16556664 is 46665561.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556663) by changing a digit.

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, 549 + ... + 5780.

Almost surely, 2^16556664 is an apocalyptic number.

It is an amenable number.

16556664 is an abundant number, since it is smaller than the sum of its proper divisors (25221336).

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

16556664 is a wasteful number, since it uses less digits than its factorization.

16556664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6447 (or 6443 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 16556664 is about 4068.9880805920. The cubic root of 16556664 is about 254.8732626648.

The spelling of 16556664 in words is "sixteen million, five hundred fifty-six thousand, six hundred sixty-four".