16642609 has 8 divisors (see below), whose sum is σ = 17750880. Its totient is φ = 15548736.

The previous prime is 16642601. The next prime is 16642621. The reversal of 16642609 is 90624661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16642609 - 2³ = 16642601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16642601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1159 + ... + 5884.

It is an arithmetic number, because the mean of its divisors is an integer number (2218860).

Almost surely, 2^16642609 is an apocalyptic number.

It is an amenable number.

16642609 is a deficient number, since it is larger than the sum of its proper divisors (1108271).

16642609 is a wasteful number, since it uses less digits than its factorization.

16642609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7199.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 16642609 is about 4079.5353902130. The cubic root of 16642609 is about 255.3135141687.

The spelling of 16642609 in words is "sixteen million, six hundred forty-two thousand, six hundred nine".