2166312340 has 24 divisors (see below), whose sum is σ = 4617158112. Its totient is φ = 853591200.

The previous prime is 2166312319. The next prime is 2166312389. The reversal of 2166312340 is 432136612.

It is a junction number, because it is equal to n+sod(n) for n = 2166312299 and 2166312308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 806986 + ... + 809665.

It is an arithmetic number, because the mean of its divisors is an integer number (192381588).

Almost surely, 2^2166312340 is an apocalyptic number.

2166312340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166312340 is an abundant number, since it is smaller than the sum of its proper divisors (2450845772).

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

2166312340 is a wasteful number, since it uses less digits than its factorization.

2166312340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616727 (or 1616725 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 2166312340 is about 46543.6605779992. The cubic root of 2166312340 is about 1293.9188045821.

Adding to 2166312340 its reverse (432136612), we get a palindrome (2598448952).

The spelling of 2166312340 in words is "two billion, one hundred sixty-six million, three hundred twelve thousand, three hundred forty".