2171863368 has 160 divisors (see below), whose sum is σ = 6221892600. Its totient is φ = 707678208.

The previous prime is 2171863363. The next prime is 2171863387. The reversal of 2171863368 is 8633681712.

2171863368 is a `hidden beast` number, since 2 + 1 + 7 + 1 + 8 + 633 + 6 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1499083524 + 672779844 = 38718^2 + 25938^2 .

It is not an unprimeable number, because it can be changed into a prime (2171863361) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6851146 + ... + 6851462.

Almost surely, 2^2171863368 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 2171863368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3110946300).

2171863368 is an abundant number, since it is smaller than the sum of its proper divisors (4050029232).

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

2171863368 is a wasteful number, since it uses less digits than its factorization.

2171863368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 528 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 2171863368 is about 46603.2549077851. The cubic root of 2171863368 is about 1295.0230549008.

The spelling of 2171863368 in words is "two billion, one hundred seventy-one million, eight hundred sixty-three thousand, three hundred sixty-eight".