1666365166999 has 8 divisors (see below), whose sum is σ = 1794566533760. Its totient is φ = 1538166576096.

The previous prime is 1666365166951. The next prime is 1666365167057. The reversal of 1666365166999 is 9996615636661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666365166999 - 2⁷ = 1666365166871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666365866999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 649117 + ... + 1937545.

It is an arithmetic number, because the mean of its divisors is an integer number (224320816720).

Almost surely, 2^{1666365166999} is an apocalyptic number.

1666365166999 is a deficient number, since it is larger than the sum of its proper divisors (128201366761).

1666365166999 is a wasteful number, since it uses less digits than its factorization.

1666365166999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387929.

The product of its digits is 510183360, while the sum is 73.

The spelling of 1666365166999 in words is "one trillion, six hundred sixty-six billion, three hundred sixty-five million, one hundred sixty-six thousand, nine hundred ninety-nine".