8645978797 has 2 divisors, whose sum is σ = 8645978798. Its totient is φ = 8645978796.

The previous prime is 8645978791. The next prime is 8645978821. The reversal of 8645978797 is 7978795468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6984112041 + 1661866756 = 83571^2 + 40766^2 .

It is a cyclic number.

It is not a de Polignac number, because 8645978797 - 2²³ = 8637590189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8645978791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4322989398 + 4322989399.

It is an arithmetic number, because the mean of its divisors is an integer number (4322989399).

Almost surely, 2^8645978797 is an apocalyptic number.

It is an amenable number.

8645978797 is a deficient number, since it is larger than the sum of its proper divisors (1).

8645978797 is an equidigital number, since it uses as much as digits as its factorization.

8645978797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 213373440, while the sum is 70.

The square root of 8645978797 is about 92983.7555543978. The cubic root of 8645978797 is about 2052.4443416489. Note that the first 3 decimals are identical.

The spelling of 8645978797 in words is "eight billion, six hundred forty-five million, nine hundred seventy-eight thousand, seven hundred ninety-seven".