2117489918865 has 64 divisors (see below), whose sum is σ = 3686030499840. Its totient is φ = 1034058078720.

The previous prime is 2117489918833. The next prime is 2117489918899. The reversal of 2117489918865 is 5688199847112.

It is a happy number.

It is not a de Polignac number, because 2117489918865 - 2⁵ = 2117489918833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2117489918865.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6800877 + ... + 7105413.

It is an arithmetic number, because the mean of its divisors is an integer number (57594226560).

Almost surely, 2^{2117489918865} is an apocalyptic number.

It is an amenable number.

2117489918865 is a deficient number, since it is larger than the sum of its proper divisors (1568540580975).

2117489918865 is a wasteful number, since it uses less digits than its factorization.

2117489918865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305382.

The product of its digits is 69672960, while the sum is 69.

The spelling of 2117489918865 in words is "two trillion, one hundred seventeen billion, four hundred eighty-nine million, nine hundred eighteen thousand, eight hundred sixty-five".