9961915656 has 64 divisors (see below), whose sum is σ = 31050132480. Its totient is φ = 2587510080.

The previous prime is 9961915643. The next prime is 9961915753. The reversal of 9961915656 is 6565191699.

It is a junction number, because it is equal to n+sod(n) for n = 9961915596 and 9961915605.

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 15 ways as a sum of consecutive naturals, for example, 2693476 + ... + 2697171.

It is an arithmetic number, because the mean of its divisors is an integer number (485158320).

Almost surely, 2^9961915656 is an apocalyptic number.

It is an amenable number.

9961915656 is an abundant number, since it is smaller than the sum of its proper divisors (21088216824).

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

9961915656 is a wasteful number, since it uses less digits than its factorization.

9961915656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5390674 (or 5390670 counting only the distinct ones).

The product of its digits is 3936600, while the sum is 57.

The square root of 9961915656 is about 99809.3966317801. The cubic root of 9961915656 is about 2151.6962029059.

The spelling of 9961915656 in words is "nine billion, nine hundred sixty-one million, nine hundred fifteen thousand, six hundred fifty-six".