66509373874580 has 96 divisors (see below), whose sum is σ = 180948580028160. Its totient is φ = 19941272064000.

The previous prime is 66509373874579. The next prime is 66509373874609. The reversal of 66509373874580 is 8547837390566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 961639421 + ... + 961708580.

It is an arithmetic number, because the mean of its divisors is an integer number (1884881041960).

Almost surely, 2^{66509373874580} is an apocalyptic number.

It is an amenable number.

66509373874580 is an abundant number, since it is smaller than the sum of its proper divisors (114439206153580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66509373874580 is a wasteful number, since it uses less digits than its factorization.

66509373874580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923348049 (or 1923348047 counting only the distinct ones).

The product of its (nonzero) digits is 914457600, while the sum is 71.

The spelling of 66509373874580 in words is "sixty-six trillion, five hundred nine billion, three hundred seventy-three million, eight hundred seventy-four thousand, five hundred eighty".