66546864566 has 32 divisors (see below), whose sum is σ = 124869799488. Its totient is φ = 25894650240.

The previous prime is 66546864563. The next prime is 66546864577.

It is a happy number.

66546864566 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66546864499 and 66546864508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66546864563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2985965 + ... + 3008168.

It is an arithmetic number, because the mean of its divisors is an integer number (3902181234).

Almost surely, 2^66546864566 is an apocalyptic number.

66546864566 is a deficient number, since it is larger than the sum of its proper divisors (58322934922).

66546864566 is a wasteful number, since it uses less digits than its factorization.

66546864566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5994216.

The product of its digits is 149299200, while the sum is 62.

The spelling of 66546864566 in words is "sixty-six billion, five hundred forty-six million, eight hundred sixty-four thousand, five hundred sixty-six".