2163591866 has 16 divisors (see below), whose sum is σ = 3364478208. Its totient is φ = 1042399200.

The previous prime is 2163591863. The next prime is 2163591889. The reversal of 2163591866 is 6681953612.

It is a happy number.

2163591866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2163591866² = 9362259525242723912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2163591866.

It is not an unprimeable number, because it can be changed into a prime (2163591863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60440 + ... + 89331.

It is an arithmetic number, because the mean of its divisors is an integer number (210279888).

Almost surely, 2^2163591866 is an apocalyptic number.

2163591866 is a deficient number, since it is larger than the sum of its proper divisors (1200886342).

2163591866 is a wasteful number, since it uses less digits than its factorization.

2163591866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150037.

The product of its digits is 466560, while the sum is 47.

The square root of 2163591866 is about 46514.4264287973. The cubic root of 2163591866 is about 1293.3769395053.

The spelling of 2163591866 in words is "two billion, one hundred sixty-three million, five hundred ninety-one thousand, eight hundred sixty-six".