7720171664 has 20 divisors (see below), whose sum is σ = 15473620860. Its totient is φ = 3726979200.

The previous prime is 7720171609. The next prime is 7720171741. The reversal of 7720171664 is 4661710277.

It can be written as a sum of positive squares in 2 ways, for example, as 3249912064 + 4470259600 = 57008^2 + 66860^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 8318687 + ... + 8319614.

It is an arithmetic number, because the mean of its divisors is an integer number (773681043).

Almost surely, 2^7720171664 is an apocalyptic number.

It is an amenable number.

7720171664 is an abundant number, since it is smaller than the sum of its proper divisors (7753449196).

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

7720171664 is a wasteful number, since it uses less digits than its factorization.

7720171664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16638338 (or 16638332 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 41.

The square root of 7720171664 is about 87864.5074190939. The cubic root of 7720171664 is about 1976.4036735318.

The spelling of 7720171664 in words is "seven billion, seven hundred twenty million, one hundred seventy-one thousand, six hundred sixty-four".