166605650020303 has 4 divisors (see below), whose sum is σ = 179421469252648. Its totient is φ = 153789830787960.

The previous prime is 166605650020301. The next prime is 166605650020331. The reversal of 166605650020303 is 303020056506661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166605650020303 - 2¹ = 166605650020301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166605650020303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166605650020301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6407909616153 + ... + 6407909616178.

It is an arithmetic number, because the mean of its divisors is an integer number (44855367313162).

Almost surely, 2^{166605650020303} is an apocalyptic number.

166605650020303 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

166605650020303 is a deficient number, since it is larger than the sum of its proper divisors (12815819232345).

166605650020303 is a wasteful number, since it uses less digits than its factorization.

166605650020303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12815819232344.

The product of its (nonzero) digits is 583200, while the sum is 43.

The spelling of 166605650020303 in words is "one hundred sixty-six trillion, six hundred five billion, six hundred fifty million, twenty thousand, three hundred three".