2172243665 has 8 divisors (see below), whose sum is σ = 2611461120. Its totient is φ = 1734615792.

The previous prime is 2172243587. The next prime is 2172243677. The reversal of 2172243665 is 5663422712.

2172243665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2172243665 - 2¹⁰ = 2172242641 is a prime.

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, 394385 + ... + 399854.

It is an arithmetic number, because the mean of its divisors is an integer number (326432640).

Almost surely, 2^2172243665 is an apocalyptic number.

It is an amenable number.

2172243665 is a deficient number, since it is larger than the sum of its proper divisors (439217455).

2172243665 is an equidigital number, since it uses as much as digits as its factorization.

2172243665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794791.

The product of its digits is 120960, while the sum is 38.

The square root of 2172243665 is about 46607.3348841145. The cubic root of 2172243665 is about 1295.0986374086.

The spelling of 2172243665 in words is "two billion, one hundred seventy-two million, two hundred forty-three thousand, six hundred sixty-five".