1155666220 has 24 divisors (see below), whose sum is σ = 2432115504. Its totient is φ = 461272896.

The previous prime is 1155666199. The next prime is 1155666223. The reversal of 1155666220 is 226665511.

It is not an unprimeable number, because it can be changed into a prime (1155666223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52527 + ... + 71206.

It is an arithmetic number, because the mean of its divisors is an integer number (101338146).

Almost surely, 2^1155666220 is an apocalyptic number.

1155666220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155666220 is an abundant number, since it is smaller than the sum of its proper divisors (1276449284).

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

1155666220 is a wasteful number, since it uses less digits than its factorization.

1155666220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124209 (or 124207 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1155666220 is about 33995.0911162185. The cubic root of 1155666220 is about 1049.4074419241.

The spelling of 1155666220 in words is "one billion, one hundred fifty-five million, six hundred sixty-six thousand, two hundred twenty".