16685663 has 2 divisors, whose sum is σ = 16685664. Its totient is φ = 16685662.

The previous prime is 16685633. The next prime is 16685671. The reversal of 16685663 is 36658661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16685663 is a prime.

It is a super-2 number, since 2×16685663² = 556822699499138, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16685663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16685633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8342831 + 8342832.

It is an arithmetic number, because the mean of its divisors is an integer number (8342832).

Almost surely, 2^16685663 is an apocalyptic number.

16685663 is a deficient number, since it is larger than the sum of its proper divisors (1).

16685663 is an equidigital number, since it uses as much as digits as its factorization.

16685663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 16685663 is about 4084.8088082553. The cubic root of 16685663 is about 255.5334877465.

The spelling of 16685663 in words is "sixteen million, six hundred eighty-five thousand, six hundred sixty-three".