2216557665 has 48 divisors (see below), whose sum is σ = 4649194368. Its totient is φ = 953676288.

The previous prime is 2216557649. The next prime is 2216557697. The reversal of 2216557665 is 5667556122.

2216557665 is a `hidden beast` number, since 2 + 2 + 16 + 5 + 576 + 65 = 666.

It is not a de Polignac number, because 2216557665 - 2⁴ = 2216557649 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2216557665.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 201607 + ... + 212316.

It is an arithmetic number, because the mean of its divisors is an integer number (96858216).

Almost surely, 2^2216557665 is an apocalyptic number.

It is an amenable number.

2216557665 is an abundant number, since it is smaller than the sum of its proper divisors (2432636703).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2216557665 is a wasteful number, since it uses less digits than its factorization.

2216557665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413958 (or 413955 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The square root of 2216557665 is about 47080.3320400356. The cubic root of 2216557665 is about 1303.8461373358.

The spelling of 2216557665 in words is "two billion, two hundred sixteen million, five hundred fifty-seven thousand, six hundred sixty-five".