9961915810 has 64 divisors (see below), whose sum is σ = 22369665024. Its totient is φ = 3103128000.

The previous prime is 9961915763. The next prime is 9961915849. The reversal of 9961915810 is 185191699.

It is a super-2 number, since 2×9961915810² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1807519 + ... + 1813021.

It is an arithmetic number, because the mean of its divisors is an integer number (349526016).

Almost surely, 2^9961915810 is an apocalyptic number.

9961915810 is an abundant number, since it is smaller than the sum of its proper divisors (12407749214).

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

9961915810 is a wasteful number, since it uses less digits than its factorization.

9961915810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7879.

The product of its (nonzero) digits is 174960, while the sum is 49.

The square root of 9961915810 is about 99809.3974032506. The cubic root of 9961915810 is about 2151.6962139935.

It can be divided in two parts, 996191 and 5810, that added together give a palindrome (1002001).

The spelling of 9961915810 in words is "nine billion, nine hundred sixty-one million, nine hundred fifteen thousand, eight hundred ten".