2216505591 has 24 divisors (see below), whose sum is σ = 3420443520. Its totient is φ = 1378997136.

The previous prime is 2216505587. The next prime is 2216505593. The reversal of 2216505591 is 1955056122.

2216505591 is a `hidden beast` number, since 2 + 2 + 1 + 65 + 0 + 5 + 591 = 666.

It is not a de Polignac number, because 2216505591 - 2² = 2216505587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216505593) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85275 + ... + 108188.

It is an arithmetic number, because the mean of its divisors is an integer number (142518480).

Almost surely, 2^2216505591 is an apocalyptic number.

2216505591 is a deficient number, since it is larger than the sum of its proper divisors (1203937929).

2216505591 is a wasteful number, since it uses less digits than its factorization.

2216505591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193555 (or 193552 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 2216505591 is about 47079.7790033046. The cubic root of 2216505591 is about 1303.8359267562.

The spelling of 2216505591 in words is "two billion, two hundred sixteen million, five hundred five thousand, five hundred ninety-one".