9961136878 has 128 divisors (see below), whose sum is σ = 20565135360. Its totient is φ = 3501792000.

The previous prime is 9961136873. The next prime is 9961136879. The reversal of 9961136878 is 8786311699.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9961136873) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 5157573 + ... + 5159503.

It is an arithmetic number, because the mean of its divisors is an integer number (160665120).

Almost surely, 2^9961136878 is an apocalyptic number.

9961136878 is an abundant number, since it is smaller than the sum of its proper divisors (10603998482).

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

9961136878 is a wasteful number, since it uses less digits than its factorization.

9961136878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054.

The product of its digits is 3919104, while the sum is 58.

The square root of 9961136878 is about 99805.4952294712. The cubic root of 9961136878 is about 2151.6401314503.

The spelling of 9961136878 in words is "nine billion, nine hundred sixty-one million, one hundred thirty-six thousand, eight hundred seventy-eight".