9806468561 has 2 divisors, whose sum is σ = 9806468562. Its totient is φ = 9806468560.

The previous prime is 9806468543. The next prime is 9806468563. The reversal of 9806468561 is 1658646089.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9573448336 + 233020225 = 97844^2 + 15265^2 .

It is a cyclic number.

It is not a de Polignac number, because 9806468561 - 2²⁶ = 9739359697 is a prime.

Together with 9806468563, 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 (9806468563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4903234280 + 4903234281.

It is an arithmetic number, because the mean of its divisors is an integer number (4903234281).

Almost surely, 2^9806468561 is an apocalyptic number.

It is an amenable number.

9806468561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9806468561 is an equidigital number, since it uses as much as digits as its factorization.

9806468561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The square root of 9806468561 is about 99027.6151434538. The cubic root of 9806468561 is about 2140.4456929010.

The spelling of 9806468561 in words is "nine billion, eight hundred six million, four hundred sixty-eight thousand, five hundred sixty-one".