11666999 has 2 divisors, whose sum is σ = 11667000. Its totient is φ = 11666998.

The previous prime is 11666989. The next prime is 11667011. The reversal of 11666999 is 99966611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11666999 - 2⁴ = 11666983 is a prime.

It is a super-2 number, since 2×11666999² = 272237731332002, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11666929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5833499 + 5833500.

It is an arithmetic number, because the mean of its divisors is an integer number (5833500).

Almost surely, 2^11666999 is an apocalyptic number.

11666999 is a deficient number, since it is larger than the sum of its proper divisors (1).

11666999 is an equidigital number, since it uses as much as digits as its factorization.

11666999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 47.

The square root of 11666999 is about 3415.6989035921. The cubic root of 11666999 is about 226.8052240605.

The spelling of 11666999 in words is "eleven million, six hundred sixty-six thousand, nine hundred ninety-nine".