66808042688206 has 4 divisors (see below), whose sum is σ = 100212064032312. Its totient is φ = 33404021344102.

The previous prime is 66808042688171. The next prime is 66808042688227. The reversal of 66808042688206 is 60288624080866.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16702010672050 + ... + 16702010672053.

It is an arithmetic number, because the mean of its divisors is an integer number (25053016008078).

Almost surely, 2^{66808042688206} is an apocalyptic number.

66808042688206 is a deficient number, since it is larger than the sum of its proper divisors (33404021344106).

66808042688206 is a wasteful number, since it uses less digits than its factorization.

66808042688206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33404021344105.

The product of its (nonzero) digits is 84934656, while the sum is 64.

The spelling of 66808042688206 in words is "sixty-six trillion, eight hundred eight billion, forty-two million, six hundred eighty-eight thousand, two hundred six".