9720515165 has 4 divisors (see below), whose sum is σ = 11664618204. Its totient is φ = 7776412128.

The previous prime is 9720515149. The next prime is 9720515201. The reversal of 9720515165 is 5615150279.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4848893956 + 4871621209 = 69634^2 + 69797^2 .

It is a cyclic number.

It is not a de Polignac number, because 9720515165 - 2⁴ = 9720515149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 972051512 + ... + 972051521.

It is an arithmetic number, because the mean of its divisors is an integer number (2916154551).

Almost surely, 2^9720515165 is an apocalyptic number.

It is an amenable number.

9720515165 is a deficient number, since it is larger than the sum of its proper divisors (1944103039).

9720515165 is a wasteful number, since it uses less digits than its factorization.

9720515165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944103038.

The product of its (nonzero) digits is 94500, while the sum is 41.

The square root of 9720515165 is about 98592.6729782695. The cubic root of 9720515165 is about 2134.1736854629.

The spelling of 9720515165 in words is "nine billion, seven hundred twenty million, five hundred fifteen thousand, one hundred sixty-five".