2111644214665 has 16 divisors (see below), whose sum is σ = 2545071699456. Its totient is φ = 1681923672000.

The previous prime is 2111644214611. The next prime is 2111644214681. The reversal of 2111644214665 is 5664124461112.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-2111644214665 is a prime.

It is a Duffinian number.

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, 1828240 + ... + 2750590.

It is an arithmetic number, because the mean of its divisors is an integer number (159066981216).

Almost surely, 2^{2111644214665} is an apocalyptic number.

It is an amenable number.

2111644214665 is a deficient number, since it is larger than the sum of its proper divisors (433427484791).

2111644214665 is a wasteful number, since it uses less digits than its factorization.

2111644214665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924360.

The product of its digits is 276480, while the sum is 43.

Adding to 2111644214665 its reverse (5664124461112), we get a palindrome (7775768675777).

The spelling of 2111644214665 in words is "two trillion, one hundred eleven billion, six hundred forty-four million, two hundred fourteen thousand, six hundred sixty-five".