11666555 has 16 divisors (see below), whose sum is σ = 14731200. Its totient is φ = 8856960.

The previous prime is 11666549. The next prime is 11666579. The reversal of 11666555 is 55566611.

It is not a de Polignac number, because 11666555 - 2⁶ = 11666491 is a prime.

It is a super-2 number, since 2×11666555² = 272217011136050, which contains 22 as substring.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8186 + ... + 9504.

It is an arithmetic number, because the mean of its divisors is an integer number (920700).

Almost surely, 2^11666555 is an apocalyptic number.

11666555 is a deficient number, since it is larger than the sum of its proper divisors (3064645).

11666555 is a wasteful number, since it uses less digits than its factorization.

11666555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414.

The product of its digits is 27000, while the sum is 35.

The square root of 11666555 is about 3415.6339089545. The cubic root of 11666555 is about 226.8023469197.

It can be divided in two parts, 11666 and 555, that added together give a palindrome (12221).

The spelling of 11666555 in words is "eleven million, six hundred sixty-six thousand, five hundred fifty-five".