16616646 has 12 divisors (see below), whose sum is σ = 36002772. Its totient is φ = 5538876.

The previous prime is 16616617. The next prime is 16616647. The reversal of 16616646 is 64661661.

16616646 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 6 + 646 = 666.

It is a super-2 number, since 2×16616646² = 552225848578632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16616646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16616647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 461556 + ... + 461591.

It is an arithmetic number, because the mean of its divisors is an integer number (3000231).

Almost surely, 2^16616646 is an apocalyptic number.

16616646 is an abundant number, since it is smaller than the sum of its proper divisors (19386126).

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

16616646 is a wasteful number, since it uses less digits than its factorization.

16616646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923155 (or 923152 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 16616646 is about 4076.3520456408. The cubic root of 16616646 is about 255.1806793319.

The spelling of 16616646 in words is "sixteen million, six hundred sixteen thousand, six hundred forty-six".