9665670811 has 32 divisors (see below), whose sum is σ = 10469606400. Its totient is φ = 8902396800.

The previous prime is 9665670809. The next prime is 9665670851. The reversal of 9665670811 is 1180765669.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 9665670811 - 2¹ = 9665670809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9665670851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14938890 + ... + 14939536.

It is an arithmetic number, because the mean of its divisors is an integer number (327175200).

Almost surely, 2^9665670811 is an apocalyptic number.

9665670811 is a deficient number, since it is larger than the sum of its proper divisors (803935589).

9665670811 is a wasteful number, since it uses less digits than its factorization.

9665670811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 9665670811 is about 98314.1434942094. The cubic root of 9665670811 is about 2130.1523553286.

The spelling of 9665670811 in words is "nine billion, six hundred sixty-five million, six hundred seventy thousand, eight hundred eleven".