9896886691 has 2 divisors, whose sum is σ = 9896886692. Its totient is φ = 9896886690.

The previous prime is 9896886689. The next prime is 9896886731. The reversal of 9896886691 is 1966886989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9896886691 - 2¹ = 9896886689 is a prime.

Together with 9896886689, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 9896886691.

It is not a weakly prime, because it can be changed into another prime (9896886631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4948443345 + 4948443346.

It is an arithmetic number, because the mean of its divisors is an integer number (4948443346).

Almost surely, 2^9896886691 is an apocalyptic number.

9896886691 is a deficient number, since it is larger than the sum of its proper divisors (1).

9896886691 is an equidigital number, since it uses as much as digits as its factorization.

9896886691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80621568, while the sum is 70.

The square root of 9896886691 is about 99483.0975141004. The cubic root of 9896886691 is about 2147.0040616528.

The spelling of 9896886691 in words is "nine billion, eight hundred ninety-six million, eight hundred eighty-six thousand, six hundred ninety-one".