9725218965 has 128 divisors (see below), whose sum is σ = 21860720640. Its totient is φ = 3984422400.

The previous prime is 9725218963. The next prime is 9725218973. The reversal of 9725218965 is 5698125279.

It is not a de Polignac number, because 9725218965 - 2¹ = 9725218963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9725218963) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 731457 + ... + 744633.

It is an arithmetic number, because the mean of its divisors is an integer number (170786880).

Almost surely, 2^9725218965 is an apocalyptic number.

It is an amenable number.

9725218965 is an abundant number, since it is smaller than the sum of its proper divisors (12135501675).

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

9725218965 is a wasteful number, since it uses less digits than its factorization.

9725218965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13280 (or 13274 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 54.

The square root of 9725218965 is about 98616.5248069511. The cubic root of 9725218965 is about 2134.5178752919.

The spelling of 9725218965 in words is "nine billion, seven hundred twenty-five million, two hundred eighteen thousand, nine hundred sixty-five".