11166555665220 has 48 divisors (see below), whose sum is σ = 31293520570368. Its totient is φ = 2975161062400.

The previous prime is 11166555665117. The next prime is 11166555665233. The reversal of 11166555665220 is 2256655566111.

11166555665220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80777709 + ... + 80915828.

It is an arithmetic number, because the mean of its divisors is an integer number (651948345216).

Almost surely, 2^{11166555665220} is an apocalyptic number.

11166555665220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11166555665220 is an abundant number, since it is smaller than the sum of its proper divisors (20126964905148).

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

11166555665220 is a wasteful number, since it uses less digits than its factorization.

11166555665220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161694700 (or 161694698 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 51.

The spelling of 11166555665220 in words is "eleven trillion, one hundred sixty-six billion, five hundred fifty-five million, six hundred sixty-five thousand, two hundred twenty".