9665555669 has 16 divisors (see below), whose sum is σ = 12066226560. Its totient is φ = 7521812160.

The previous prime is 9665555659. The next prime is 9665555737.

9665555669 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 9665555669 - 2⁸ = 9665555413 is a prime.

It is a super-2 number, since 2×9665555669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9665555639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21674 + ... + 140715.

It is an arithmetic number, because the mean of its divisors is an integer number (754139160).

Almost surely, 2^9665555669 is an apocalyptic number.

It is an amenable number.

9665555669 is a deficient number, since it is larger than the sum of its proper divisors (2400670891).

9665555669 is a wasteful number, since it uses less digits than its factorization.

9665555669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163180.

The product of its digits is 65610000, while the sum is 62.

The square root of 9665555669 is about 98313.5579103920. The cubic root of 9665555669 is about 2130.1438968373.

The spelling of 9665555669 in words is "nine billion, six hundred sixty-five million, five hundred fifty-five thousand, six hundred sixty-nine".