2244021665 has 4 divisors (see below), whose sum is σ = 2692826004. Its totient is φ = 1795217328.

The previous prime is 2244021649. The next prime is 2244021673. The reversal of 2244021665 is 5661204422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 464531809 + 1779489856 = 21553^2 + 42184^2 .

It is a cyclic number.

It is not a de Polignac number, because 2244021665 - 2⁴ = 2244021649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224402162 + ... + 224402171.

It is an arithmetic number, because the mean of its divisors is an integer number (673206501).

Almost surely, 2^2244021665 is an apocalyptic number.

It is an amenable number.

2244021665 is a deficient number, since it is larger than the sum of its proper divisors (448804339).

2244021665 is an equidigital number, since it uses as much as digits as its factorization.

2244021665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448804338.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 2244021665 is about 47371.1058030103. The cubic root of 2244021665 is about 1309.2090995449.

The spelling of 2244021665 in words is "two billion, two hundred forty-four million, twenty-one thousand, six hundred sixty-five".