2215944500865 has 16 divisors (see below), whose sum is σ = 3545723870208. Its totient is φ = 1181766177536.

The previous prime is 2215944500837. The next prime is 2215944500873. The reversal of 2215944500865 is 5680054495122.

It is a cyclic number.

It is not a de Polignac number, because 2215944500865 - 2⁹ = 2215944500353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4171704 + ... + 4672793.

It is an arithmetic number, because the mean of its divisors is an integer number (221607741888).

Almost surely, 2^{2215944500865} is an apocalyptic number.

It is an amenable number.

2215944500865 is a deficient number, since it is larger than the sum of its proper divisors (1329779369343).

2215944500865 is a wasteful number, since it uses less digits than its factorization.

2215944500865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8861208.

The product of its (nonzero) digits is 3456000, while the sum is 51.

Adding to 2215944500865 its reverse (5680054495122), we get a palindrome (7895998995987).

The spelling of 2215944500865 in words is "two trillion, two hundred fifteen billion, nine hundred forty-four million, five hundred thousand, eight hundred sixty-five".