11666491211 has 2 divisors, whose sum is σ = 11666491212. Its totient is φ = 11666491210.

The previous prime is 11666491183. The next prime is 11666491217. The reversal of 11666491211 is 11219466611.

11666491211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11666491211 - 2¹⁸ = 11666229067 is a prime.

It is a super-2 number, since 2×11666491211² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11666491217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5833245605 + 5833245606.

It is an arithmetic number, because the mean of its divisors is an integer number (5833245606).

Almost surely, 2^11666491211 is an apocalyptic number.

11666491211 is a deficient number, since it is larger than the sum of its proper divisors (1).

11666491211 is an equidigital number, since it uses as much as digits as its factorization.

11666491211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The spelling of 11666491211 in words is "eleven billion, six hundred sixty-six million, four hundred ninety-one thousand, two hundred eleven".