2215857643 has 4 divisors (see below), whose sum is σ = 2237370928. Its totient is φ = 2194344360.

The previous prime is 2215857619. The next prime is 2215857667. The reversal of 2215857643 is 3467585122.

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

It is an interprime number because it is at equal distance from previous prime (2215857619) and next prime (2215857667).

It is a cyclic number.

It is not a de Polignac number, because 2215857643 - 2⁹ = 2215857131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2215857643.

It is not an unprimeable number, because it can be changed into a prime (2215857613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10756488 + ... + 10756693.

It is an arithmetic number, because the mean of its divisors is an integer number (559342732).

Almost surely, 2^2215857643 is an apocalyptic number.

2215857643 is a deficient number, since it is larger than the sum of its proper divisors (21513285).

2215857643 is a wasteful number, since it uses less digits than its factorization.

2215857643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21513284.

The product of its digits is 403200, while the sum is 43.

The square root of 2215857643 is about 47072.8971171310. The cubic root of 2215857643 is about 1303.7088648591.

The spelling of 2215857643 in words is "two billion, two hundred fifteen million, eight hundred fifty-seven thousand, six hundred forty-three".