8120961689648 has 20 divisors (see below), whose sum is σ = 16276927525440. Its totient is φ = 3920464263744.

The previous prime is 8120961689629. The next prime is 8120961689699. The reversal of 8120961689648 is 8469861690218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8751035840 + ... + 8751036767.

It is an arithmetic number, because the mean of its divisors is an integer number (813846376272).

Almost surely, 2^{8120961689648} is an apocalyptic number.

It is an amenable number.

8120961689648 is an abundant number, since it is smaller than the sum of its proper divisors (8155965835792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8120961689648 is a wasteful number, since it uses less digits than its factorization.

8120961689648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17502072644 (or 17502072638 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 68.

The spelling of 8120961689648 in words is "eight trillion, one hundred twenty billion, nine hundred sixty-one million, six hundred eighty-nine thousand, six hundred forty-eight".