2163606858 has 72 divisors (see below), whose sum is σ = 5460177060. Its totient is φ = 617379840.

The previous prime is 2163606833. The next prime is 2163606869. The reversal of 2163606858 is 8586063612.

2163606858 is a `hidden beast` number, since 2 + 1 + 636 + 0 + 6 + 8 + 5 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1240237089 + 923369769 = 35217^2 + 30387^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1241868 + ... + 1243608.

Almost surely, 2^2163606858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2163606858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2730088530).

2163606858 is an abundant number, since it is smaller than the sum of its proper divisors (3296570202).

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

2163606858 is a wasteful number, since it uses less digits than its factorization.

2163606858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3172 (or 3162 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 2163606858 is about 46514.5875828218. The cubic root of 2163606858 is about 1293.3799268620.

The spelling of 2163606858 in words is "two billion, one hundred sixty-three million, six hundred six thousand, eight hundred fifty-eight".