4425021666 has 48 divisors (see below), whose sum is σ = 10681103160. Its totient is φ = 1314593280.

The previous prime is 4425021641. The next prime is 4425021673. The reversal of 4425021666 is 6661205244.

It can be written as a sum of positive squares in 4 ways, for example, as 3605402025 + 819619641 = 60045^2 + 28629^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 4425021666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 319255 + ... + 332826.

Almost surely, 2^4425021666 is an apocalyptic number.

4425021666 is an abundant number, since it is smaller than the sum of its proper divisors (6256081494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4425021666 is a wasteful number, since it uses less digits than its factorization.

4425021666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652131 (or 652128 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 4425021666 is about 66520.8363296794. The cubic root of 4425021666 is about 1641.7428509891.

The spelling of 4425021666 in words is "four billion, four hundred twenty-five million, twenty-one thousand, six hundred sixty-six".