16646646 has 16 divisors (see below), whose sum is σ = 33695424. Its totient is φ = 5481864.

The previous prime is 16646639. The next prime is 16646657. The reversal of 16646646 is 64664661.

It is a super-2 number, since 2×16646646² = 554221646098632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16216 + ... + 17211.

It is an arithmetic number, because the mean of its divisors is an integer number (2105964).

Almost surely, 2^16646646 is an apocalyptic number.

16646646 is an abundant number, since it is smaller than the sum of its proper divisors (17048778).

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

16646646 is a wasteful number, since it uses less digits than its factorization.

16646646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33515.

The product of its digits is 124416, while the sum is 39.

The square root of 16646646 is about 4080.0301469474. The cubic root of 16646646 is about 255.3341563114.

The spelling of 16646646 in words is "sixteen million, six hundred forty-six thousand, six hundred forty-six".