2201591866 has 4 divisors (see below), whose sum is σ = 3302387802. Its totient is φ = 1100795932.

The previous prime is 2201591837. The next prime is 2201591867. The reversal of 2201591866 is 6681951022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1569823641 + 631768225 = 39621^2 + 25135^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2201591867) by changing a digit.

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 as a sum of consecutive naturals, namely, 550397965 + ... + 550397968.

Almost surely, 2^2201591866 is an apocalyptic number.

2201591866 is a deficient number, since it is larger than the sum of its proper divisors (1100795936).

2201591866 is a wasteful number, since it uses less digits than its factorization.

2201591866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100795935.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 2201591866 is about 46921.1238782704. The cubic root of 2201591866 is about 1300.9050632376.

The spelling of 2201591866 in words is "two billion, two hundred one million, five hundred ninety-one thousand, eight hundred sixty-six".