8500721966 has 8 divisors (see below), whose sum is σ = 13910272344. Its totient is φ = 3863964520.

The previous prime is 8500721963. The next prime is 8500721989. The reversal of 8500721966 is 6691270058.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8500721963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193198205 + ... + 193198248.

It is an arithmetic number, because the mean of its divisors is an integer number (1738784043).

Almost surely, 2^8500721966 is an apocalyptic number.

8500721966 is a deficient number, since it is larger than the sum of its proper divisors (5409550378).

8500721966 is a wasteful number, since it uses less digits than its factorization.

8500721966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386396466.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 8500721966 is about 92199.3599001642. The cubic root of 8500721966 is about 2040.8853300328.

The spelling of 8500721966 in words is "eight billion, five hundred million, seven hundred twenty-one thousand, nine hundred sixty-six".