11666217 has 8 divisors (see below), whose sum is σ = 15593760. Its totient is φ = 7758080.

The previous prime is 11666191. The next prime is 11666227. The reversal of 11666217 is 71266611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11666217 - 2¹⁵ = 11633449 is a prime.

It is a super-3 number, since 3×11666217³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (11666227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3384 + ... + 5897.

It is an arithmetic number, because the mean of its divisors is an integer number (1949220).

Almost surely, 2^11666217 is an apocalyptic number.

It is an amenable number.

11666217 is a deficient number, since it is larger than the sum of its proper divisors (3927543).

11666217 is an equidigital number, since it uses as much as digits as its factorization.

11666217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9703.

The product of its digits is 3024, while the sum is 30.

The square root of 11666217 is about 3415.5844302257. The cubic root of 11666217 is about 226.8001566149.

It can be divided in two parts, 1166621 and 7, that added together give a triangular number (1166628 = T₁₅₂₇).

The spelling of 11666217 in words is "eleven million, six hundred sixty-six thousand, two hundred seventeen".