1166055220 has 72 divisors (see below), whose sum is σ = 2710237824. Its totient is φ = 421080000.

The previous prime is 1166055217. The next prime is 1166055239. The reversal of 1166055220 is 225506611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 363825 + ... + 367015.

It is an arithmetic number, because the mean of its divisors is an integer number (37642192).

Almost surely, 2^1166055220 is an apocalyptic number.

1166055220 is a gapful number since it is divisible by the number (10) 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 1166055220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1355118912).

1166055220 is an abundant number, since it is smaller than the sum of its proper divisors (1544182604).

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

1166055220 is a wasteful number, since it uses less digits than its factorization.

1166055220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373 (or 3360 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1166055220 is about 34147.5507174380. The cubic root of 1166055220 is about 1052.5426571367.

The spelling of 1166055220 in words is "one billion, one hundred sixty-six million, fifty-five thousand, two hundred twenty".