9961896506659 has 2 divisors, whose sum is σ = 9961896506660. Its totient is φ = 9961896506658.

The previous prime is 9961896506657. The next prime is 9961896506693. The reversal of 9961896506659 is 9566056981699.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9961896506659 - 2¹ = 9961896506657 is a prime.

Together with 9961896506657, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9961896506651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980948253329 + 4980948253330.

It is an arithmetic number, because the mean of its divisors is an integer number (4980948253330).

Almost surely, 2^{9961896506659} is an apocalyptic number.

9961896506659 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961896506659 is an equidigital number, since it uses as much as digits as its factorization.

9961896506659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1700611200, while the sum is 79.

The spelling of 9961896506659 in words is "nine trillion, nine hundred sixty-one billion, eight hundred ninety-six million, five hundred six thousand, six hundred fifty-nine".