4381664643 has 24 divisors (see below), whose sum is σ = 6776686800. Its totient is φ = 2718380544.

The previous prime is 4381664641. The next prime is 4381664647. The reversal of 4381664643 is 3464661834.

It is a happy number.

It is not a de Polignac number, because 4381664643 - 2¹ = 4381664641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4381664641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147273 + ... + 174506.

It is an arithmetic number, because the mean of its divisors is an integer number (282361950).

Almost surely, 2^4381664643 is an apocalyptic number.

4381664643 is a deficient number, since it is larger than the sum of its proper divisors (2395022157).

4381664643 is a wasteful number, since it uses less digits than its factorization.

4381664643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321891 (or 321888 counting only the distinct ones).

The product of its digits is 995328, while the sum is 45.

The square root of 4381664643 is about 66194.1435702585. The cubic root of 4381664643 is about 1636.3632285664.

The spelling of 4381664643 in words is "four billion, three hundred eighty-one million, six hundred sixty-four thousand, six hundred forty-three".