9665649423 has 12 divisors (see below), whose sum is σ = 13967412888. Its totient is φ = 6441034320.

The previous prime is 9665649401. The next prime is 9665649431. The reversal of 9665649423 is 3249465669.

9665649423 is a `hidden beast` number, since 96 + 65 + 6 + 494 + 2 + 3 = 666.

It is not a de Polignac number, because 9665649423 - 2⁶ = 9665649359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9665649423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9665649493) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205140 + ... + 247817.

It is an arithmetic number, because the mean of its divisors is an integer number (1163951074).

Almost surely, 2^9665649423 is an apocalyptic number.

9665649423 is a deficient number, since it is larger than the sum of its proper divisors (4301763465).

9665649423 is a wasteful number, since it uses less digits than its factorization.

9665649423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455334 (or 455331 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 54.

The square root of 9665649423 is about 98314.0347203796. The cubic root of 9665649423 is about 2130.1507841415.

The spelling of 9665649423 in words is "nine billion, six hundred sixty-five million, six hundred forty-nine thousand, four hundred twenty-three".