9640811113561 has 2 divisors, whose sum is σ = 9640811113562. Its totient is φ = 9640811113560.

The previous prime is 9640811113523. The next prime is 9640811113589. The reversal of 9640811113561 is 1653111180469.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5902620879961 + 3738190233600 = 2429531^2 + 1933440^2 .

It is a cyclic number.

It is not a de Polignac number, because 9640811113561 - 2²³ = 9640802724953 is a prime.

It is a super-2 number, since 2×9640811113561² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9640811110561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4820405556780 + 4820405556781.

It is an arithmetic number, because the mean of its divisors is an integer number (4820405556781).

Almost surely, 2^{9640811113561} is an apocalyptic number.

It is an amenable number.

9640811113561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9640811113561 is an equidigital number, since it uses as much as digits as its factorization.

9640811113561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 9640811113561 in words is "nine trillion, six hundred forty billion, eight hundred eleven million, one hundred thirteen thousand, five hundred sixty-one".