2166320816 has 40 divisors (see below), whose sum is σ = 4653900048. Its totient is φ = 968544000.

The previous prime is 2166320809. The next prime is 2166320837. The reversal of 2166320816 is 6180236612.

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, 90155 + ... + 111626.

Almost surely, 2^2166320816 is an apocalyptic number.

It is an amenable number.

2166320816 is an abundant number, since it is smaller than the sum of its proper divisors (2487579232).

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

2166320816 is a wasteful number, since it uses less digits than its factorization.

2166320816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201861 (or 201855 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 2166320816 is about 46543.7516322009. The cubic root of 2166320816 is about 1293.9204921260.

The spelling of 2166320816 in words is "two billion, one hundred sixty-six million, three hundred twenty thousand, eight hundred sixteen".