2215663987 has 4 divisors (see below), whose sum is σ = 2215854576. Its totient is φ = 2215473400.

The previous prime is 2215663981. The next prime is 2215663997. The reversal of 2215663987 is 7893665122.

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

It is a cyclic number.

It is not a de Polignac number, because 2215663987 - 2³ = 2215663979 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 2215663987.

It is not an unprimeable number, because it can be changed into a prime (2215663981) 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, 76639 + ... + 101512.

It is an arithmetic number, because the mean of its divisors is an integer number (553963644).

Almost surely, 2^2215663987 is an apocalyptic number.

2215663987 is a deficient number, since it is larger than the sum of its proper divisors (190589).

2215663987 is a wasteful number, since it uses less digits than its factorization.

2215663987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190588.

The product of its digits is 1088640, while the sum is 49.

The square root of 2215663987 is about 47070.8400923544. The cubic root of 2215663987 is about 1303.6708843207.

The spelling of 2215663987 in words is "two billion, two hundred fifteen million, six hundred sixty-three thousand, nine hundred eighty-seven".