16660207 has 4 divisors (see below), whose sum is σ = 17537080. Its totient is φ = 15783336.

The previous prime is 16660157. The next prime is 16660219. The reversal of 16660207 is 70206661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16660207 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 (16660247) 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, 438408 + ... + 438445.

It is an arithmetic number, because the mean of its divisors is an integer number (4384270).

Almost surely, 2^16660207 is an apocalyptic number.

16660207 is a deficient number, since it is larger than the sum of its proper divisors (876873).

16660207 is an equidigital number, since it uses as much as digits as its factorization.

16660207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876872.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 16660207 is about 4081.6916836037. The cubic root of 16660207 is about 255.4034725102.

Adding to 16660207 its reverse (70206661), we get a palindrome (86866868).

The spelling of 16660207 in words is "sixteen million, six hundred sixty thousand, two hundred seven".