16997668 has 6 divisors (see below), whose sum is σ = 29745926. Its totient is φ = 8498832.

The previous prime is 16997639. The next prime is 16997677. The reversal of 16997668 is 86679961.

It can be written as a sum of positive squares in only one way, i.e., 16305444 + 692224 = 4038^2 + 832^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2124705 + ... + 2124712.

Almost surely, 2^16997668 is an apocalyptic number.

It is an amenable number.

16997668 is a deficient number, since it is larger than the sum of its proper divisors (12748258).

16997668 is a wasteful number, since it uses less digits than its factorization.

16997668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249421 (or 4249419 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 16997668 is about 4122.8228193799. The cubic root of 16997668 is about 257.1164012171.

The spelling of 16997668 in words is "sixteen million, nine hundred ninety-seven thousand, six hundred sixty-eight".