2166208452 has 72 divisors (see below), whose sum is σ = 5660578560. Its totient is φ = 697757760.

The previous prime is 2166208441. The next prime is 2166208477. The reversal of 2166208452 is 2548026612.

It is a happy number.

2166208452 is a `hidden beast` number, since 21 + 6 + 620 + 8 + 4 + 5 + 2 = 666.

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

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, 1297074 + ... + 1298742.

Almost surely, 2^2166208452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166208452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2830289280).

2166208452 is an abundant number, since it is smaller than the sum of its proper divisors (3494370108).

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

2166208452 is a wasteful number, since it uses less digits than its factorization.

2166208452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873 (or 2868 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 2166208452 is about 46542.5445372296. The cubic root of 2166208452 is about 1293.8981204633.

The spelling of 2166208452 in words is "two billion, one hundred sixty-six million, two hundred eight thousand, four hundred fifty-two".