16868661 has 4 divisors (see below), whose sum is σ = 22491552. Its totient is φ = 11245772.

The previous prime is 16868653. The next prime is 16868669. The reversal of 16868661 is 16686861.

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 an interprime number because it is at equal distance from previous prime (16868653) and next prime (16868669).

It is a cyclic number.

It is not a de Polignac number, because 16868661 - 2³ = 16868653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16868669) 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, 2811441 + ... + 2811446.

It is an arithmetic number, because the mean of its divisors is an integer number (5622888).

Almost surely, 2^16868661 is an apocalyptic number.

It is an amenable number.

16868661 is a deficient number, since it is larger than the sum of its proper divisors (5622891).

16868661 is an equidigital number, since it uses as much as digits as its factorization.

16868661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5622890.

The product of its digits is 82944, while the sum is 42.

The square root of 16868661 is about 4107.1475503079. The cubic root of 16868661 is about 256.4642708309.

The spelling of 16868661 in words is "sixteen million, eight hundred sixty-eight thousand, six hundred sixty-one".