16640168 has 8 divisors (see below), whose sum is σ = 31200330. Its totient is φ = 8320080.

The previous prime is 16640167. The next prime is 16640177. The reversal of 16640168 is 86104661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14730244 + 1909924 = 3838^2 + 1382^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (16640167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040003 + ... + 1040018.

Almost surely, 2^16640168 is an apocalyptic number.

It is an amenable number.

16640168 is a deficient number, since it is larger than the sum of its proper divisors (14560162).

16640168 is a wasteful number, since it uses less digits than its factorization.

16640168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080027 (or 2080023 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 16640168 is about 4079.2362030164. The cubic root of 16640168 is about 255.3010311348.

The spelling of 16640168 in words is "sixteen million, six hundred forty thousand, one hundred sixty-eight".