2166719568 has 160 divisors (see below), whose sum is σ = 6399590400. Its totient is φ = 626185728.

The previous prime is 2166719551. The next prime is 2166719603. The reversal of 2166719568 is 8659176612.

It is a self number, because there is not a number n which added to its sum of digits gives 2166719568.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1504993 + ... + 1506431.

It is an arithmetic number, because the mean of its divisors is an integer number (39997440).

Almost surely, 2^2166719568 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 2166719568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3199795200).

2166719568 is an abundant number, since it is smaller than the sum of its proper divisors (4232870832).

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

2166719568 is a wasteful number, since it uses less digits than its factorization.

2166719568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609 (or 1603 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 2166719568 is about 46548.0350605694. The cubic root of 2166719568 is about 1293.9998773716. Note that the first 3 decimals are identical.

The spelling of 2166719568 in words is "two billion, one hundred sixty-six million, seven hundred nineteen thousand, five hundred sixty-eight".