16622605 has 4 divisors (see below), whose sum is σ = 19947132. Its totient is φ = 13298080.

The previous prime is 16622581. The next prime is 16622623. The reversal of 16622605 is 50622661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6086089 + 10536516 = 2467^2 + 3246^2 .

It is not a de Polignac number, because 16622605 - 2²³ = 8233997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662256 + ... + 1662265.

It is an arithmetic number, because the mean of its divisors is an integer number (4986783).

Almost surely, 2^16622605 is an apocalyptic number.

It is an amenable number.

16622605 is a deficient number, since it is larger than the sum of its proper divisors (3324527).

16622605 is an equidigital number, since it uses as much as digits as its factorization.

16622605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324526.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 16622605 is about 4077.0829032533. The cubic root of 16622605 is about 255.2111796693.

It can be divided in two parts, 166 and 22605, that multiplied together give a triangular number (3752430 = T₂₇₃₉).

The spelling of 16622605 in words is "sixteen million, six hundred twenty-two thousand, six hundred five".