968691955921 has 2 divisors, whose sum is σ = 968691955922. Its totient is φ = 968691955920.

The previous prime is 968691955919. The next prime is 968691955963. The reversal of 968691955921 is 129559196869.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 917695025296 + 50996930625 = 957964^2 + 225825^2 .

It is a cyclic number.

It is not a de Polignac number, because 968691955921 - 2¹ = 968691955919 is a prime.

Together with 968691955919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (968691955981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 484345977960 + 484345977961.

It is an arithmetic number, because the mean of its divisors is an integer number (484345977961).

Almost surely, 2^968691955921 is an apocalyptic number.

It is an amenable number.

968691955921 is a deficient number, since it is larger than the sum of its proper divisors (1).

968691955921 is an equidigital number, since it uses as much as digits as its factorization.

968691955921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94478400, while the sum is 70.

The spelling of 968691955921 in words is "nine hundred sixty-eight billion, six hundred ninety-one million, nine hundred fifty-five thousand, nine hundred twenty-one".