4221744665 has 4 divisors (see below), whose sum is σ = 5066093604. Its totient is φ = 3377395728.

The previous prime is 4221744649. The next prime is 4221744671. The reversal of 4221744665 is 5664471224.

It is a happy number.

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 2955879424 + 1265865241 = 54368^2 + 35579^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221744665 - 2⁴ = 4221744649 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, 422174462 + ... + 422174471.

It is an arithmetic number, because the mean of its divisors is an integer number (1266523401).

Almost surely, 2^4221744665 is an apocalyptic number.

It is an amenable number.

4221744665 is a deficient number, since it is larger than the sum of its proper divisors (844348939).

4221744665 is an equidigital number, since it uses as much as digits as its factorization.

4221744665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844348938.

The product of its digits is 322560, while the sum is 41.

The square root of 4221744665 is about 64974.9541361900. The cubic root of 4221744665 is about 1616.2082565855.

The spelling of 4221744665 in words is "four billion, two hundred twenty-one million, seven hundred forty-four thousand, six hundred sixty-five".