2166798816 has 576 divisors, whose sum is σ = 8236892160. Its totient is φ = 548674560.

The previous prime is 2166798797. The next prime is 2166798833. The reversal of 2166798816 is 6188976612.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17061345 + ... + 17061471.

It is an arithmetic number, because the mean of its divisors is an integer number (14300160).

Almost surely, 2^2166798816 is an apocalyptic number.

2166798816 is a gapful number since it is divisible by the number (26) 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 2166798816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4118446080).

2166798816 is an abundant number, since it is smaller than the sum of its proper divisors (6070093344).

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

2166798816 is a wasteful number, since it uses less digits than its factorization.

2166798816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 183 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 2166798816 is about 46548.8863024670. The cubic root of 2166798816 is about 1294.0156532406.

The spelling of 2166798816 in words is "two billion, one hundred sixty-six million, seven hundred ninety-eight thousand, eight hundred sixteen".