66573437566 has 8 divisors (see below), whose sum is σ = 100578575160. Its totient is φ = 33047245848.

The previous prime is 66573437549. The next prime is 66573437573.

It is a happy number.

66573437566 is nontrivially palindromic in base 10.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66573437566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119736121 + ... + 119736676.

It is an arithmetic number, because the mean of its divisors is an integer number (12572321895).

Almost surely, 2^66573437566 is an apocalyptic number.

66573437566 is a deficient number, since it is larger than the sum of its proper divisors (34005137594).

66573437566 is a wasteful number, since it uses less digits than its factorization.

66573437566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239472938.

The product of its digits is 57153600, while the sum is 58.

The spelling of 66573437566 in words is "sixty-six billion, five hundred seventy-three million, four hundred thirty-seven thousand, five hundred sixty-six".