11666549 has 2 divisors, whose sum is σ = 11666550. Its totient is φ = 11666548.

The previous prime is 11666533. The next prime is 11666579. The reversal of 11666549 is 94566611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10355524 + 1311025 = 3218^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 11666549 - 2⁴ = 11666533 is a prime.

It is a super-2 number, since 2×11666549² = 272216731138802, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11666579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5833274 + 5833275.

It is an arithmetic number, because the mean of its divisors is an integer number (5833275).

Almost surely, 2^11666549 is an apocalyptic number.

It is an amenable number.

11666549 is a deficient number, since it is larger than the sum of its proper divisors (1).

11666549 is an equidigital number, since it uses as much as digits as its factorization.

11666549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 11666549 is about 3415.6330306401. The cubic root of 11666549 is about 226.8023080389.

The spelling of 11666549 in words is "eleven million, six hundred sixty-six thousand, five hundred forty-nine".