9965217565 has 8 divisors (see below), whose sum is σ = 12587643360. Its totient is φ = 7552585872.

The previous prime is 9965217547. The next prime is 9965217571. The reversal of 9965217565 is 5657125699.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9965217565 - 2²¹ = 9963120413 is a prime.

It is a super-2 number, since 2×9965217565² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52448419 + ... + 52448608.

It is an arithmetic number, because the mean of its divisors is an integer number (1573455420).

Almost surely, 2^9965217565 is an apocalyptic number.

9965217565 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

9965217565 is a deficient number, since it is larger than the sum of its proper divisors (2622425795).

9965217565 is a wasteful number, since it uses less digits than its factorization.

9965217565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104897051.

The product of its digits is 5103000, while the sum is 55.

The square root of 9965217565 is about 99825.9363342012. The cubic root of 9965217565 is about 2151.9339055221.

The spelling of 9965217565 in words is "nine billion, nine hundred sixty-five million, two hundred seventeen thousand, five hundred sixty-five".