66020040666 has 24 divisors (see below), whose sum is σ = 143061437844. Its totient is φ = 22003908480.

The previous prime is 66020040649. The next prime is 66020040701. The reversal of 66020040666 is 66604002066.

It can be written as a sum of positive squares in 2 ways, for example, as 65726089641 + 293951025 = 256371^2 + 17145^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66020040666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81481 + ... + 372396.

Almost surely, 2^66020040666 is an apocalyptic number.

66020040666 is an abundant number, since it is smaller than the sum of its proper divisors (77041397178).

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

66020040666 is a wasteful number, since it uses less digits than its factorization.

66020040666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461966 (or 461963 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The spelling of 66020040666 in words is "sixty-six billion, twenty million, forty thousand, six hundred sixty-six".