16655609 has 4 divisors (see below), whose sum is σ = 17532240. Its totient is φ = 15778980.

The previous prime is 16655593. The next prime is 16655633. The reversal of 16655609 is 90655661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16655609 - 2⁴ = 16655593 is a prime.

It is a super-2 number, since 2×16655609² = 554818622321762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16655689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438287 + ... + 438324.

It is an arithmetic number, because the mean of its divisors is an integer number (4383060).

Almost surely, 2^16655609 is an apocalyptic number.

16655609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16655609 is a deficient number, since it is larger than the sum of its proper divisors (876631).

16655609 is an equidigital number, since it uses as much as digits as its factorization.

16655609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876630.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 16655609 is about 4081.1283978821. The cubic root of 16655609 is about 255.3799743384.

The spelling of 16655609 in words is "sixteen million, six hundred fifty-five thousand, six hundred nine".