11666606555 has 8 divisors (see below), whose sum is σ = 14005418352. Its totient is φ = 9329624928.

The previous prime is 11666606543. The next prime is 11666606561. The reversal of 11666606555 is 55560666611.

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 11666606555 - 2¹⁸ = 11666344411 is a prime.

It is a super-2 number, since 2×11666606555² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443477 + ... + 469046.

It is an arithmetic number, because the mean of its divisors is an integer number (1750677294).

Almost surely, 2^11666606555 is an apocalyptic number.

11666606555 is a deficient number, since it is larger than the sum of its proper divisors (2338811797).

11666606555 is an equidigital number, since it uses as much as digits as its factorization.

11666606555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915085.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 11666606555 in words is "eleven billion, six hundred sixty-six million, six hundred six thousand, five hundred fifty-five".