9165868561 has 4 divisors (see below), whose sum is σ = 9251530992. Its totient is φ = 9080206132.

The previous prime is 9165868541. The next prime is 9165868589. The reversal of 9165868561 is 1658685619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1658685619 = 2909 ⋅570191.

It is a cyclic number.

It is not a de Polignac number, because 9165868561 - 2¹⁵ = 9165835793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9165868531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42831055 + ... + 42831268.

It is an arithmetic number, because the mean of its divisors is an integer number (2312882748).

Almost surely, 2^9165868561 is an apocalyptic number.

It is an amenable number.

9165868561 is a deficient number, since it is larger than the sum of its proper divisors (85662431).

9165868561 is a wasteful number, since it uses less digits than its factorization.

9165868561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85662430.

The product of its digits is 3110400, while the sum is 55.

The square root of 9165868561 is about 95738.5427139979. The cubic root of 9165868561 is about 2092.7846523673.

The spelling of 9165868561 in words is "nine billion, one hundred sixty-five million, eight hundred sixty-eight thousand, five hundred sixty-one".