11666135808 has 360 divisors, whose sum is σ = 36985820256. Its totient is φ = 3649536000.

The previous prime is 11666135749. The next prime is 11666135813. The reversal of 11666135808 is 80853166611.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 29092408 + ... + 29092808.

Almost surely, 2^11666135808 is an apocalyptic number.

11666135808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11666135808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18492910128).

11666135808 is an abundant number, since it is smaller than the sum of its proper divisors (25319684448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11666135808 is an equidigital number, since it uses as much as digits as its factorization.

11666135808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 11666135808 in words is "eleven billion, six hundred sixty-six million, one hundred thirty-five thousand, eight hundred eight".