9665677921 has 8 divisors (see below), whose sum is σ = 9686315520. Its totient is φ = 9645059472.

The previous prime is 9665677867. The next prime is 9665677961. The reversal of 9665677921 is 1297765669.

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 9665677921 - 2²⁵ = 9632123489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9665677961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1435200 + ... + 1441918.

It is an arithmetic number, because the mean of its divisors is an integer number (1210789440).

Almost surely, 2^9665677921 is an apocalyptic number.

It is an amenable number.

9665677921 is a deficient number, since it is larger than the sum of its proper divisors (20637599).

9665677921 is a wasteful number, since it uses less digits than its factorization.

9665677921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9575.

The product of its digits is 8573040, while the sum is 58.

The square root of 9665677921 is about 98314.1796538017. The cubic root of 9665677921 is about 2130.1528776369.

The spelling of 9665677921 in words is "nine billion, six hundred sixty-five million, six hundred seventy-seven thousand, nine hundred twenty-one".