9665997215 has 16 divisors (see below), whose sum is σ = 13258211328. Its totient is φ = 6627119136.

The previous prime is 9665997137. The next prime is 9665997283. The reversal of 9665997215 is 5127995669.

It is a cyclic number.

It is not a de Polignac number, because 9665997215 - 2⁸ = 9665996959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276194 + ... + 309216.

It is an arithmetic number, because the mean of its divisors is an integer number (828638208).

Almost surely, 2^9665997215 is an apocalyptic number.

9665997215 is a deficient number, since it is larger than the sum of its proper divisors (3592214113).

9665997215 is a wasteful number, since it uses less digits than its factorization.

9665997215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41398.

The product of its digits is 9185400, while the sum is 59.

The square root of 9665997215 is about 98315.8034855028. The cubic root of 9665997215 is about 2130.1763330547.

The spelling of 9665997215 in words is "nine billion, six hundred sixty-five million, nine hundred ninety-seven thousand, two hundred fifteen".