66545054566 has 24 divisors (see below), whose sum is σ = 107944361280. Its totient is φ = 30728436816.

The previous prime is 66545054549. The next prime is 66545054581.

66545054566 is nontrivially palindromic in base 10.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1053750 + ... + 1115113.

It is an arithmetic number, because the mean of its divisors is an integer number (4497681720).

Almost surely, 2^66545054566 is an apocalyptic number.

66545054566 is a deficient number, since it is larger than the sum of its proper divisors (41399306714).

66545054566 is a wasteful number, since it uses less digits than its factorization.

66545054566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168940 (or 2168917 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 52.

The spelling of 66545054566 in words is "sixty-six billion, five hundred forty-five million, fifty-four thousand, five hundred sixty-six".