444445555566666 has 64 divisors (see below), whose sum is σ = 962033080780800. Its totient is φ = 136422757526400.

The previous prime is 444445555566641. The next prime is 444445555566743. The reversal of 444445555566666 is 666665555544444.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174174136 + ... + 176707443.

It is an arithmetic number, because the mean of its divisors is an integer number (15031766887200).

Almost surely, 2^{444445555566666} is an apocalyptic number.

444445555566666 is an abundant number, since it is smaller than the sum of its proper divisors (517587525214134).

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

444445555566666 is a wasteful number, since it uses less digits than its factorization.

444445555566666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350881915.

The product of its digits is 24883200000, while the sum is 75.

The spelling of 444445555566666 in words is "four hundred forty-four trillion, four hundred forty-five billion, five hundred fifty-five million, five hundred sixty-six thousand, six hundred sixty-six".