2159613666 has 48 divisors (see below), whose sum is σ = 5662185984. Its totient is φ = 580735872.

The previous prime is 2159613647. The next prime is 2159613689. The reversal of 2159613666 is 6663169512.

It is a Curzon 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 23 ways as a sum of consecutive naturals, for example, 501970 + ... + 506253.

It is an arithmetic number, because the mean of its divisors is an integer number (117962208).

Almost surely, 2^2159613666 is an apocalyptic number.

2159613666 is an abundant number, since it is smaller than the sum of its proper divisors (3502572318).

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

2159613666 is a wasteful number, since it uses less digits than its factorization.

2159613666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008255 (or 1008252 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 2159613666 is about 46471.6436765475. The cubic root of 2159613666 is about 1292.5837417044.

The spelling of 2159613666 in words is "two billion, one hundred fifty-nine million, six hundred thirteen thousand, six hundred sixty-six".