8564334661 has 2 divisors, whose sum is σ = 8564334662. Its totient is φ = 8564334660.

The previous prime is 8564334641. The next prime is 8564334673. The reversal of 8564334661 is 1664334658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8116208100 + 448126561 = 90090^2 + 21169^2 .

It is a cyclic number.

It is not a de Polignac number, because 8564334661 - 2¹⁹ = 8563810373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8564334641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4282167330 + 4282167331.

It is an arithmetic number, because the mean of its divisors is an integer number (4282167331).

Almost surely, 2^8564334661 is an apocalyptic number.

It is an amenable number.

8564334661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8564334661 is an equidigital number, since it uses as much as digits as its factorization.

8564334661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 46.

The square root of 8564334661 is about 92543.6905520846. The cubic root of 8564334661 is about 2045.9634758339.

The spelling of 8564334661 in words is "eight billion, five hundred sixty-four million, three hundred thirty-four thousand, six hundred sixty-one".