16618685 has 8 divisors (see below), whose sum is σ = 20126040. Its totient is φ = 13172544.

The previous prime is 16618663. The next prime is 16618687. The reversal of 16618685 is 58681661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 401956 + 16216729 = 634^2 + 4027^2 .

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 16618685 - 2⁸ = 16618429 is a prime.

It is a super-2 number, since 2×16618685² = 552361382258450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16618687) 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, 14702 + ... + 15791.

It is an arithmetic number, because the mean of its divisors is an integer number (2515755).

Almost surely, 2^16618685 is an apocalyptic number.

It is an amenable number.

16618685 is a deficient number, since it is larger than the sum of its proper divisors (3507355).

16618685 is a wasteful number, since it uses less digits than its factorization.

16618685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30607.

The product of its digits is 69120, while the sum is 41.

The square root of 16618685 is about 4076.6021390369. The cubic root of 16618685 is about 255.1911164988.

The spelling of 16618685 in words is "sixteen million, six hundred eighteen thousand, six hundred eighty-five".