1666266594801 has 16 divisors (see below), whose sum is σ = 2334962273280. Its totient is φ = 1054902586320.

The previous prime is 1666266594787. The next prime is 1666266594803. The reversal of 1666266594801 is 1084956626661.

It is not a de Polignac number, because 1666266594801 - 2⁷ = 1666266594673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666266594803) 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, 86856565 + ... + 86875746.

It is an arithmetic number, because the mean of its divisors is an integer number (145935142080).

Almost surely, 2^{1666266594801} is an apocalyptic number.

It is an amenable number.

1666266594801 is a deficient number, since it is larger than the sum of its proper divisors (668695678479).

1666266594801 is a wasteful number, since it uses less digits than its factorization.

1666266594801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173732476.

The product of its (nonzero) digits is 22394880, while the sum is 60.

The spelling of 1666266594801 in words is "one trillion, six hundred sixty-six billion, two hundred sixty-six million, five hundred ninety-four thousand, eight hundred one".