8640064813 has 2 divisors, whose sum is σ = 8640064814. Its totient is φ = 8640064812.

The previous prime is 8640064781. The next prime is 8640064817. The reversal of 8640064813 is 3184600468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6793386084 + 1846678729 = 82422^2 + 42973^2 .

It is a cyclic number.

It is not a de Polignac number, because 8640064813 - 2⁵ = 8640064781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8640064817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320032406 + 4320032407.

It is an arithmetic number, because the mean of its divisors is an integer number (4320032407).

Almost surely, 2^8640064813 is an apocalyptic number.

It is an amenable number.

8640064813 is a deficient number, since it is larger than the sum of its proper divisors (1).

8640064813 is an equidigital number, since it uses as much as digits as its factorization.

8640064813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 8640064813 is about 92951.9489467542. The cubic root of 8640064813 is about 2051.9762669562.

The spelling of 8640064813 in words is "eight billion, six hundred forty million, sixty-four thousand, eight hundred thirteen".