66931671822 has 16 divisors (see below), whose sum is σ = 141737658192. Its totient is φ = 20998171520.

The previous prime is 66931671803. The next prime is 66931671881. The reversal of 66931671822 is 22817613966.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328096329 + ... + 328096532.

It is an arithmetic number, because the mean of its divisors is an integer number (8858603637).

Almost surely, 2^66931671822 is an apocalyptic number.

66931671822 is an abundant number, since it is smaller than the sum of its proper divisors (74805986370).

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

66931671822 is a wasteful number, since it uses less digits than its factorization.

66931671822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656192883.

The product of its digits is 1306368, while the sum is 51.

The spelling of 66931671822 in words is "sixty-six billion, nine hundred thirty-one million, six hundred seventy-one thousand, eight hundred twenty-two".