2613221665 has 16 divisors (see below), whose sum is σ = 3150639360. Its totient is φ = 2080753920.

The previous prime is 2613221651. The next prime is 2613221683. The reversal of 2613221665 is 5661223162.

It is a de Polignac number, because none of the positive numbers 2^k-2613221665 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2613221665.

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, 1208185 + ... + 1210345.

It is an arithmetic number, because the mean of its divisors is an integer number (196914960).

Almost surely, 2^2613221665 is an apocalyptic number.

It is an amenable number.

2613221665 is a deficient number, since it is larger than the sum of its proper divisors (537417695).

2613221665 is a wasteful number, since it uses less digits than its factorization.

2613221665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3192.

The product of its digits is 25920, while the sum is 34.

The square root of 2613221665 is about 51119.6798209848. The cubic root of 2613221665 is about 1377.3957861571.

The spelling of 2613221665 in words is "two billion, six hundred thirteen million, two hundred twenty-one thousand, six hundred sixty-five".