16644623 has 2 divisors, whose sum is σ = 16644624. Its totient is φ = 16644622.

The previous prime is 16644587. The next prime is 16644629. The reversal of 16644623 is 32644661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16644623 - 2⁸ = 16644367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16644623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16644629) 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, 8322311 + 8322312.

It is an arithmetic number, because the mean of its divisors is an integer number (8322312).

Almost surely, 2^16644623 is an apocalyptic number.

16644623 is a deficient number, since it is larger than the sum of its proper divisors (1).

16644623 is an equidigital number, since it uses as much as digits as its factorization.

16644623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 32.

The square root of 16644623 is about 4079.7822245801. The cubic root of 16644623 is about 255.3238126477.

The spelling of 16644623 in words is "sixteen million, six hundred forty-four thousand, six hundred twenty-three".