11155166220 has 48 divisors (see below), whose sum is σ = 34073964288. Its totient is φ = 2704282560.

The previous prime is 11155166213. The next prime is 11155166237. The reversal of 11155166220 is 2266155111.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 8450224 + ... + 8451543.

It is an arithmetic number, because the mean of its divisors is an integer number (709874256).

Almost surely, 2^11155166220 is an apocalyptic number.

11155166220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11155166220 is an abundant number, since it is smaller than the sum of its proper divisors (22918798068).

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

11155166220 is a wasteful number, since it uses less digits than its factorization.

11155166220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16901790 (or 16901788 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

It can be divided in two parts, 111551 and 66220, that added together give a palindrome (177771).

The spelling of 11155166220 in words is "eleven billion, one hundred fifty-five million, one hundred sixty-six thousand, two hundred twenty".