2116665 has 16 divisors (see below), whose sum is σ = 3763200. Its totient is φ = 1128816.

The previous prime is 2116663. The next prime is 2116669. The reversal of 2116665 is 5666112.

It is a happy number.

It is not a de Polignac number, because 2116665 - 2¹ = 2116663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

2116665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2116663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7705 + ... + 7974.

It is an arithmetic number, because the mean of its divisors is an integer number (235200).

2^2116665 is an apocalyptic number.

It is an amenable number.

2116665 is a deficient number, since it is larger than the sum of its proper divisors (1646535).

2116665 is a wasteful number, since it uses less digits than its factorization.

2116665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15693 (or 15687 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 2116665 is about 1454.8762834001. The cubic root of 2116665 is about 128.3957680499.

The spelling of 2116665 in words is "two million, one hundred sixteen thousand, six hundred sixty-five".