16685589 has 4 divisors (see below), whose sum is σ = 22247456. Its totient is φ = 11123724.

The previous prime is 16685587. The next prime is 16685593. The reversal of 16685589 is 98558661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98558661 = 3 ⋅32852887.

It is not a de Polignac number, because 16685589 - 2¹ = 16685587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16685587) 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, 2780929 + ... + 2780934.

It is an arithmetic number, because the mean of its divisors is an integer number (5561864).

Almost surely, 2^16685589 is an apocalyptic number.

It is an amenable number.

16685589 is a deficient number, since it is larger than the sum of its proper divisors (5561867).

16685589 is an equidigital number, since it uses as much as digits as its factorization.

16685589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561866.

The product of its digits is 518400, while the sum is 48.

The square root of 16685589 is about 4084.7997502938. The cubic root of 16685589 is about 255.5331099869.

The spelling of 16685589 in words is "sixteen million, six hundred eighty-five thousand, five hundred eighty-nine".