16216685 has 4 divisors (see below), whose sum is σ = 19460028. Its totient is φ = 12973344.

The previous prime is 16216663. The next prime is 16216703. The reversal of 16216685 is 58661261.

It is a happy number.

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 6895876 + 9320809 = 2626^2 + 3053^2 .

It is a cyclic number.

It is not a de Polignac number, because 16216685 - 2⁸ = 16216429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621664 + ... + 1621673.

It is an arithmetic number, because the mean of its divisors is an integer number (4865007).

Almost surely, 2^16216685 is an apocalyptic number.

It is an amenable number.

16216685 is a deficient number, since it is larger than the sum of its proper divisors (3243343).

16216685 is an equidigital number, since it uses as much as digits as its factorization.

16216685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243342.

The product of its digits is 17280, while the sum is 35.

The square root of 16216685 is about 4026.9945368724. The cubic root of 16216685 is about 253.1166381427.

The spelling of 16216685 in words is "sixteen million, two hundred sixteen thousand, six hundred eighty-five".