8546566409 has 2 divisors, whose sum is σ = 8546566410. Its totient is φ = 8546566408.

The previous prime is 8546566367. The next prime is 8546566439. The reversal of 8546566409 is 9046656458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7997367184 + 549199225 = 89428^2 + 23435^2 .

It is a cyclic number.

It is not a de Polignac number, because 8546566409 - 2²⁰ = 8545517833 is a prime.

It is not a weakly prime, because it can be changed into another prime (8546566439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4273283204 + 4273283205.

It is an arithmetic number, because the mean of its divisors is an integer number (4273283205).

Almost surely, 2^8546566409 is an apocalyptic number.

It is an amenable number.

8546566409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8546566409 is an equidigital number, since it uses as much as digits as its factorization.

8546566409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6220800, while the sum is 53.

The square root of 8546566409 is about 92447.6414463885. The cubic root of 8546566409 is about 2044.5475898567.

The spelling of 8546566409 in words is "eight billion, five hundred forty-six million, five hundred sixty-six thousand, four hundred nine".