1443363881666 has 16 divisors (see below), whose sum is σ = 2497038434880. Its totient is φ = 612909432720.

The previous prime is 1443363881647. The next prime is 1443363881669. The reversal of 1443363881666 is 6661883633441.

It is not an unprimeable number, because it can be changed into a prime (1443363881669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472922420 + ... + 472925471.

It is an arithmetic number, because the mean of its divisors is an integer number (156064902180).

Almost surely, 2^{1443363881666} is an apocalyptic number.

1443363881666 is a deficient number, since it is larger than the sum of its proper divisors (1053674553214).

1443363881666 is a wasteful number, since it uses less digits than its factorization.

1443363881666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945848009.

The product of its digits is 35831808, while the sum is 59.

The spelling of 1443363881666 in words is "one trillion, four hundred forty-three billion, three hundred sixty-three million, eight hundred eighty-one thousand, six hundred sixty-six".