8618806681 has 2 divisors, whose sum is σ = 8618806682. Its totient is φ = 8618806680.

The previous prime is 8618806649. The next prime is 8618806739. The reversal of 8618806681 is 1866088168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7856163225 + 762643456 = 88635^2 + 27616^2 .

It is a cyclic number.

It is not a de Polignac number, because 8618806681 - 2⁵ = 8618806649 is a prime.

It is a super-2 number, since 2×8618806681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8618806621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4309403340 + 4309403341.

It is an arithmetic number, because the mean of its divisors is an integer number (4309403341).

Almost surely, 2^8618806681 is an apocalyptic number.

It is an amenable number.

8618806681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8618806681 is an equidigital number, since it uses as much as digits as its factorization.

8618806681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 884736, while the sum is 52.

The square root of 8618806681 is about 92837.5284085051. The cubic root of 8618806681 is about 2050.2919814926.

The spelling of 8618806681 in words is "eight billion, six hundred eighteen million, eight hundred six thousand, six hundred eighty-one".