2166246378 has 24 divisors (see below), whose sum is σ = 4704242400. Its totient is φ = 720434664.

The previous prime is 2166246371. The next prime is 2166246391. The reversal of 2166246378 is 8736426612.

2166246378 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 2 + 4 + 637 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (2166246371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129168 + ... + 144971.

It is an arithmetic number, because the mean of its divisors is an integer number (196010100).

Almost surely, 2^2166246378 is an apocalyptic number.

2166246378 is an abundant number, since it is smaller than the sum of its proper divisors (2537996022).

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

2166246378 is a wasteful number, since it uses less digits than its factorization.

2166246378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274586 (or 274583 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 2166246378 is about 46542.9519691220. The cubic root of 2166246378 is about 1293.9056716131.

The spelling of 2166246378 in words is "two billion, one hundred sixty-six million, two hundred forty-six thousand, three hundred seventy-eight".