444555666 has 24 divisors (see below), whose sum is σ = 989237964. Its totient is φ = 144180000.

The previous prime is 444555649. The next prime is 444555667. The reversal of 444555666 is 666555444.

It can be written as a sum of positive squares in 2 ways, for example, as 441882441 + 2673225 = 21021^2 + 1635^2 .

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (444555667) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 333085 + ... + 334416.

Almost surely, 2^444555666 is an apocalyptic number.

444555666 is an abundant number, since it is smaller than the sum of its proper divisors (544682298).

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

444555666 is a wasteful number, since it uses less digits than its factorization.

444555666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667546 (or 667543 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 45.

The square root of 444555666 is about 21084.4887535838. The cubic root of 444555666 is about 763.2064815088.

The spelling of 444555666 in words is "four hundred forty-four million, five hundred fifty-five thousand, six hundred sixty-six".