8564774681 has 2 divisors, whose sum is σ = 8564774682. Its totient is φ = 8564774680.

The previous prime is 8564774599. The next prime is 8564774683. The reversal of 8564774681 is 1864774658.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6328998025 + 2235776656 = 79555^2 + 47284^2 .

It is a cyclic number.

It is not a de Polignac number, because 8564774681 - 2²² = 8560580377 is a prime.

It is a super-2 number, since 2×8564774681² (a number of 21 digits) contains 22 as substring.

Together with 8564774683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8564774683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4282387340 + 4282387341.

It is an arithmetic number, because the mean of its divisors is an integer number (4282387341).

Almost surely, 2^8564774681 is an apocalyptic number.

It is an amenable number.

8564774681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8564774681 is an equidigital number, since it uses as much as digits as its factorization.

8564774681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 56.

The square root of 8564774681 is about 92546.0678851349. The cubic root of 8564774681 is about 2045.9985145328.

The spelling of 8564774681 in words is "eight billion, five hundred sixty-four million, seven hundred seventy-four thousand, six hundred eighty-one".