2221916661 has 12 divisors (see below), whose sum is σ = 3312965760. Its totient is φ = 1433494440.

The previous prime is 2221916621. The next prime is 2221916701. The reversal of 2221916661 is 1666191222.

It is an interprime number because it is at equal distance from previous prime (2221916621) and next prime (2221916701).

It is not a de Polignac number, because 2221916661 - 2¹⁴ = 2221900277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221916621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3981651 + ... + 3982208.

It is an arithmetic number, because the mean of its divisors is an integer number (276080480).

Almost surely, 2^2221916661 is an apocalyptic number.

It is an amenable number.

2221916661 is a deficient number, since it is larger than the sum of its proper divisors (1091049099).

2221916661 is a wasteful number, since it uses less digits than its factorization.

2221916661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7963896 (or 7963893 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 2221916661 is about 47137.2110015007. The cubic root of 2221916661 is about 1304.8960660609.

The spelling of 2221916661 in words is "two billion, two hundred twenty-one million, nine hundred sixteen thousand, six hundred sixty-one".