2643316665 has 32 divisors (see below), whose sum is σ = 4618325376. Its totient is φ = 1280348160.

The previous prime is 2643316661. The next prime is 2643316673. The reversal of 2643316665 is 5666133462.

It is a happy number.

It is not a de Polignac number, because 2643316665 - 2² = 2643316661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2643316661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173017 + ... + 187673.

It is an arithmetic number, because the mean of its divisors is an integer number (144322668).

Almost surely, 2^2643316665 is an apocalyptic number.

It is an amenable number.

2643316665 is a deficient number, since it is larger than the sum of its proper divisors (1975008711).

2643316665 is a wasteful number, since it uses less digits than its factorization.

2643316665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15769.

The product of its digits is 466560, while the sum is 42.

The square root of 2643316665 is about 51413.1954365803. The cubic root of 2643316665 is about 1382.6631805354.

The spelling of 2643316665 in words is "two billion, six hundred forty-three million, three hundred sixteen thousand, six hundred sixty-five".