4445555666 has 16 divisors (see below), whose sum is σ = 7065792960. Its totient is φ = 2091841200.

The previous prime is 4445555633. The next prime is 4445555669. The reversal of 4445555666 is 6665555444.

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 (4445555669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381641 + ... + 393116.

It is an arithmetic number, because the mean of its divisors is an integer number (441612060).

Almost surely, 2^4445555666 is an apocalyptic number.

4445555666 is a deficient number, since it is larger than the sum of its proper divisors (2620237294).

4445555666 is a wasteful number, since it uses less digits than its factorization.

4445555666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774929.

The product of its digits is 8640000, while the sum is 50.

The square root of 4445555666 is about 66675.0003074616. Note that the first 3 decimals coincide. The cubic root of 4445555666 is about 1644.2783968695.

The spelling of 4445555666 in words is "four billion, four hundred forty-five million, five hundred fifty-five thousand, six hundred sixty-six".