16623663 has 16 divisors (see below), whose sum is σ = 25762560. Its totient is φ = 9337536.

The previous prime is 16623653. The next prime is 16623683. The reversal of 16623663 is 36632661.

It is a happy number.

It is not a de Polignac number, because 16623663 - 2⁸ = 16623407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16623623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5470 + ... + 7947.

It is an arithmetic number, because the mean of its divisors is an integer number (1610160).

Almost surely, 2^16623663 is an apocalyptic number.

16623663 is a deficient number, since it is larger than the sum of its proper divisors (9138897).

16623663 is a wasteful number, since it uses less digits than its factorization.

16623663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13486.

The product of its digits is 23328, while the sum is 33.

The square root of 16623663 is about 4077.2126508192. The cubic root of 16623663 is about 255.2165941375.

The spelling of 16623663 in words is "sixteen million, six hundred twenty-three thousand, six hundred sixty-three".