9661991094 has 32 divisors (see below), whose sum is σ = 24538391040. Its totient is φ = 2760568776.

The previous prime is 9661991071. The next prime is 9661991137. The reversal of 9661991094 is 4901991669.

9661991094 is a `hidden beast` number, since 9 + 6 + 619 + 9 + 10 + 9 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 9661991094.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 12780034 + ... + 12780789.

It is an arithmetic number, because the mean of its divisors is an integer number (766824720).

Almost surely, 2^9661991094 is an apocalyptic number.

9661991094 is an abundant number, since it is smaller than the sum of its proper divisors (14876399946).

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

9661991094 is a wasteful number, since it uses less digits than its factorization.

9661991094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25560841 (or 25560835 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The square root of 9661991094 is about 98295.4276352669. The cubic root of 9661991094 is about 2129.8820049692.

The spelling of 9661991094 in words is "nine billion, six hundred sixty-one million, nine hundred ninety-one thousand, ninety-four".