1666128045828 has 48 divisors (see below), whose sum is σ = 3890071204544. Its totient is φ = 555027707520.

The previous prime is 1666128045823. The next prime is 1666128045893. The reversal of 1666128045828 is 8285408216661.

It is not an unprimeable number, because it can be changed into a prime (1666128045823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194160498 + ... + 194169078.

Almost surely, 2^{1666128045828} is an apocalyptic number.

It is an amenable number.

1666128045828 is an abundant number, since it is smaller than the sum of its proper divisors (2223943158716).

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

1666128045828 is a wasteful number, since it uses less digits than its factorization.

1666128045828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16852 (or 16850 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 57.

The spelling of 1666128045828 in words is "one trillion, six hundred sixty-six billion, one hundred twenty-eight million, forty-five thousand, eight hundred twenty-eight".