9961799894 has 16 divisors (see below), whose sum is σ = 15311989440. Its totient is φ = 4859092680.

The previous prime is 9961799867. The next prime is 9961799909. The reversal of 9961799894 is 4989971699.

It is a super-2 number, since 2×9961799894² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306764 + ... + 337679.

It is an arithmetic number, because the mean of its divisors is an integer number (956999340).

Almost surely, 2^9961799894 is an apocalyptic number.

9961799894 is a deficient number, since it is larger than the sum of its proper divisors (5350189546).

9961799894 is a wasteful number, since it uses less digits than its factorization.

9961799894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644635.

The product of its digits is 79361856, while the sum is 71.

The square root of 9961799894 is about 99808.8167147572. The cubic root of 9961799894 is about 2151.6878683101.

The spelling of 9961799894 in words is "nine billion, nine hundred sixty-one million, seven hundred ninety-nine thousand, eight hundred ninety-four".