16660231 has 16 divisors (see below), whose sum is σ = 19722240. Its totient is φ = 13777920.

The previous prime is 16660229. The next prime is 16660247. The reversal of 16660231 is 13206661.

It is a cyclic number.

It is not a de Polignac number, because 16660231 - 2¹ = 16660229 is a prime.

It is a super-2 number, since 2×16660231² = 555126593946722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16660196 and 16660205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16660271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25671 + ... + 26311.

It is an arithmetic number, because the mean of its divisors is an integer number (1232640).

Almost surely, 2^16660231 is an apocalyptic number.

16660231 is a deficient number, since it is larger than the sum of its proper divisors (3062009).

16660231 is an equidigital number, since it uses as much as digits as its factorization.

16660231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 16660231 is about 4081.6946235602. The cubic root of 16660231 is about 255.4035951513.

Adding to 16660231 its reverse (13206661), we get a palindrome (29866892).

The spelling of 16660231 in words is "sixteen million, six hundred sixty thousand, two hundred thirty-one".