444444555666666 has 128 divisors (see below), whose sum is σ = 919817395142400. Its totient is φ = 143058734807040.

The previous prime is 444444555666547. The next prime is 444444555666763. The reversal of 444444555666666 is 666666555444444.

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 63 ways as a sum of consecutive naturals, for example, 33439505481 + ... + 33439518771.

It is an arithmetic number, because the mean of its divisors is an integer number (7186073399550).

Almost surely, 2^{444444555666666} is an apocalyptic number.

444444555666666 is an abundant number, since it is smaller than the sum of its proper divisors (475372839475734).

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

444444555666666 is a wasteful number, since it uses less digits than its factorization.

444444555666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15704.

The product of its digits is 23887872000, while the sum is 75.

The spelling of 444444555666666 in words is "four hundred forty-four trillion, four hundred forty-four billion, five hundred fifty-five million, six hundred sixty-six thousand, six hundred sixty-six".