72163668666 has 8 divisors (see below), whose sum is σ = 144327337344. Its totient is φ = 24054556220.

The previous prime is 72163668641. The next prime is 72163668677. The reversal of 72163668666 is 66686636127.

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

72163668666 is an admirable number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 6013639050 + ... + 6013639061.

It is an arithmetic number, because the mean of its divisors is an integer number (18040917168).

Almost surely, 2^72163668666 is an apocalyptic number.

72163668666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

72163668666 is a wasteful number, since it uses less digits than its factorization.

72163668666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12027278116.

The product of its digits is 15676416, while the sum is 57.

The spelling of 72163668666 in words is "seventy-two billion, one hundred sixty-three million, six hundred sixty-eight thousand, six hundred sixty-six".