9725665279 has 12 divisors (see below), whose sum is σ = 10703483560. Its totient is φ = 8830522800.

The previous prime is 9725665277. The next prime is 9725665289.

9725665279 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9725665279 - 2¹ = 9725665277 is a prime.

It is a super-2 number, since 2×9725665279² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9725665277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48577 + ... + 147685.

Almost surely, 2^9725665279 is an apocalyptic number.

9725665279 is a deficient number, since it is larger than the sum of its proper divisors (977818281).

9725665279 is a wasteful number, since it uses less digits than its factorization.

9725665279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99942 (or 99931 counting only the distinct ones).

The product of its digits is 14288400, while the sum is 58.

The square root of 9725665279 is about 98618.7876573222. The cubic root of 9725665279 is about 2134.5505275348.

The spelling of 9725665279 in words is "nine billion, seven hundred twenty-five million, six hundred sixty-five thousand, two hundred seventy-nine".