9729171664 has 10 divisors (see below), whose sum is σ = 18850270130. Its totient is φ = 4864585824.

The previous prime is 9729171611. The next prime is 9729171679. The reversal of 9729171664 is 4661719279.

It can be written as a sum of positive squares in only one way, i.e., 9064563264 + 664608400 = 95208^2 + 25780^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304036599 + ... + 304036630.

It is an arithmetic number, because the mean of its divisors is an integer number (1885027013).

Almost surely, 2^9729171664 is an apocalyptic number.

It is an amenable number.

9729171664 is a deficient number, since it is larger than the sum of its proper divisors (9121098466).

9729171664 is a wasteful number, since it uses less digits than its factorization.

9729171664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608073237 (or 608073231 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 52.

The square root of 9729171664 is about 98636.5635248917. The cubic root of 9729171664 is about 2134.8070192143.

The spelling of 9729171664 in words is "nine billion, seven hundred twenty-nine million, one hundred seventy-one thousand, six hundred sixty-four".