11666223585 has 16 divisors (see below), whose sum is σ = 20739953280. Its totient is φ = 6221985840.

The previous prime is 11666223551. The next prime is 11666223593. The reversal of 11666223585 is 58532266611.

It is not a de Polignac number, because 11666223585 - 2¹⁷ = 11666092513 is a prime.

It is a super-2 number, since 2×11666223585² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11666223585.

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 15 ways as a sum of consecutive naturals, for example, 43208101 + ... + 43208370.

It is an arithmetic number, because the mean of its divisors is an integer number (1296247080).

Almost surely, 2^11666223585 is an apocalyptic number.

11666223585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11666223585 is a deficient number, since it is larger than the sum of its proper divisors (9073729695).

11666223585 is an equidigital number, since it uses as much as digits as its factorization.

11666223585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86416485 (or 86416479 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 11666223585 in words is "eleven billion, six hundred sixty-six million, two hundred twenty-three thousand, five hundred eighty-five".