2165665612 has 24 divisors (see below), whose sum is σ = 4138943760. Its totient is φ = 983324160.

The previous prime is 2165665609. The next prime is 2165665687.

2165665612 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14964 + ... + 67492.

It is an arithmetic number, because the mean of its divisors is an integer number (172455990).

Almost surely, 2^2165665612 is an apocalyptic number.

2165665612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2165665612 is a deficient number, since it is larger than the sum of its proper divisors (1973278148).

2165665612 is a wasteful number, since it uses less digits than its factorization.

2165665612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53481 (or 53479 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 2165665612 is about 46536.7125181829. The cubic root of 2165665612 is about 1293.7900301678.

The spelling of 2165665612 in words is "two billion, one hundred sixty-five million, six hundred sixty-five thousand, six hundred twelve".