2166159988 has 24 divisors (see below), whose sum is σ = 3944200680. Its totient is φ = 1039678080.

The previous prime is 2166159977. The next prime is 2166159991. The reversal of 2166159988 is 8899516612.

It can be written as a sum of positive squares in 4 ways, for example, as 1164310884 + 1001849104 = 34122^2 + 31652^2 .

It is a super-2 number, since 2×2166159988² = 9384498187224320288, which contains 22 as substring.

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, 33903 + ... + 74038.

It is an arithmetic number, because the mean of its divisors is an integer number (164341695).

Almost surely, 2^2166159988 is an apocalyptic number.

It is an amenable number.

2166159988 is a deficient number, since it is larger than the sum of its proper divisors (1778040692).

2166159988 is a wasteful number, since it uses less digits than its factorization.

2166159988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108147 (or 108145 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 55.

The square root of 2166159988 is about 46542.0238923921. The cubic root of 2166159988 is about 1293.8884710462. Note that the first 3 decimals are identical.

The spelling of 2166159988 in words is "two billion, one hundred sixty-six million, one hundred fifty-nine thousand, nine hundred eighty-eight".