11666611 has 8 divisors (see below), whose sum is σ = 12854448. Its totient is φ = 10500000.

The previous prime is 11666579. The next prime is 11666617.

11666611 is nontrivially palindromic in base 10.

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 11666611 - 2⁵ = 11666579 is a prime.

It is a super-2 number, since 2×11666611² = 272219624450642, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 11666611.

It is not an unprimeable number, because it can be changed into a prime (11666617) 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, 4140 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (1606806).

Almost surely, 2^11666611 is an apocalyptic number.

11666611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11666611 is a deficient number, since it is larger than the sum of its proper divisors (1187837).

11666611 is a wasteful number, since it uses less digits than its factorization.

11666611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10613.

The product of its digits is 1296, while the sum is 28.

The square root of 11666611 is about 3415.6421065445. The cubic root of 11666611 is about 226.8027098063.

It can be divided in two parts, 1166 and 6611, that added together give a palindrome (7777).

The spelling of 11666611 in words is "eleven million, six hundred sixty-six thousand, six hundred eleven".