8191698064 has 105 divisors (see below), whose sum is σ = 18545939689. Its totient is φ = 3504469760.

The previous prime is 8191698049. The next prime is 8191698071. The reversal of 8191698064 is 4608961918.

The square root of 8191698064 is 90508.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6377619600 + 1814078464 = 79860^2 + 42592^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 481864584 + ... + 481864600.

Almost surely, 2^8191698064 is an apocalyptic number.

8191698064 is the 90508-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8191698064

8191698064 is an abundant number, since it is smaller than the sum of its proper divisors (10354241625).

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

8191698064 is an frugal number, since it uses more digits than its factorization.

8191698064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 52.

The cubic root of 8191698064 is about 2015.8489128920.

The spelling of 8191698064 in words is "eight billion, one hundred ninety-one million, six hundred ninety-eight thousand, sixty-four".