1666128573803 has 2 divisors, whose sum is σ = 1666128573804. Its totient is φ = 1666128573802.

The previous prime is 1666128573799. The next prime is 1666128573817. The reversal of 1666128573803 is 3083758216661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666128573803 - 2² = 1666128573799 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666128579803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833064286901 + 833064286902.

It is an arithmetic number, because the mean of its divisors is an integer number (833064286902).

Almost surely, 2^{1666128573803} is an apocalyptic number.

1666128573803 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666128573803 is an equidigital number, since it uses as much as digits as its factorization.

1666128573803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 1666128573803 in words is "one trillion, six hundred sixty-six billion, one hundred twenty-eight million, five hundred seventy-three thousand, eight hundred three".