11666665115611 has 8 divisors (see below), whose sum is σ = 12727306395648. Its totient is φ = 10606029729000.

The previous prime is 11666665115587. The next prime is 11666665115627. The reversal of 11666665115611 is 11651156666611.

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 11666665115611 - 2¹⁵ = 11666665082843 is a prime.

It is a super-2 number, since 2×11666665115611² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11666665115681) 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, 3353326 + ... + 5880316.

It is an arithmetic number, because the mean of its divisors is an integer number (1590913299456).

Almost surely, 2^{11666665115611} is an apocalyptic number.

11666665115611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11666665115611 is a deficient number, since it is larger than the sum of its proper divisors (1060641280037).

11666665115611 is a wasteful number, since it uses less digits than its factorization.

11666665115611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2946713.

The product of its digits is 1166400, while the sum is 52.

The spelling of 11666665115611 in words is "eleven trillion, six hundred sixty-six billion, six hundred sixty-five million, one hundred fifteen thousand, six hundred eleven".