11566706220 has 72 divisors (see below), whose sum is σ = 35747698896. Its totient is φ = 3026255232.

The previous prime is 11566706219. The next prime is 11566706321. The reversal of 11566706220 is 2260766511.

It is a happy number.

11566706220 is a `hidden beast` number, since 1 + 1 + 566 + 70 + 6 + 2 + 20 = 666.

It is a super-3 number, since 3×11566706220³ (a number of 31 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 596682 + ... + 615761.

It is an arithmetic number, because the mean of its divisors is an integer number (496495818).

Almost surely, 2^11566706220 is an apocalyptic number.

11566706220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11566706220 is an abundant number, since it is smaller than the sum of its proper divisors (24180992676).

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

11566706220 is a wasteful number, since it uses less digits than its factorization.

11566706220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212511 (or 1212506 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 11566706220 in words is "eleven billion, five hundred sixty-six million, seven hundred six thousand, two hundred twenty".