16646668 has 6 divisors (see below), whose sum is σ = 29131676. Its totient is φ = 8323332.

The previous prime is 16646657. The next prime is 16646671. The reversal of 16646668 is 86664661.

It is a super-2 number, since 2×16646668² = 554223111004448, which contains 22 as substring.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2080830 + ... + 2080837.

Almost surely, 2^16646668 is an apocalyptic number.

It is an amenable number.

16646668 is a deficient number, since it is larger than the sum of its proper divisors (12485008).

16646668 is a wasteful number, since it uses less digits than its factorization.

16646668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4161671 (or 4161669 counting only the distinct ones).

The product of its digits is 248832, while the sum is 43.

The square root of 16646668 is about 4080.0328430051. The cubic root of 16646668 is about 255.3342687935.

The spelling of 16646668 in words is "sixteen million, six hundred forty-six thousand, six hundred sixty-eight".