4421661243 has 16 divisors (see below), whose sum is σ = 6221007360. Its totient is φ = 2787925184.

The previous prime is 4421661229. The next prime is 4421661281. The reversal of 4421661243 is 3421661244.

It is a happy number.

4421661243 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 4421661243 - 2¹⁴ = 4421644859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4421665243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353871 + ... + 366152.

It is an arithmetic number, because the mean of its divisors is an integer number (388812960).

Almost surely, 2^4421661243 is an apocalyptic number.

4421661243 is a deficient number, since it is larger than the sum of its proper divisors (1799346117).

4421661243 is a wasteful number, since it uses less digits than its factorization.

4421661243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720138.

The product of its digits is 27648, while the sum is 33.

The square root of 4421661243 is about 66495.5731082904. The cubic root of 4421661243 is about 1641.3271582918.

Subtracting from 4421661243 its reverse (3421661244), we obtain a palindrome (999999999).

The spelling of 4421661243 in words is "four billion, four hundred twenty-one million, six hundred sixty-one thousand, two hundred forty-three".