9961969920 has 144 divisors (see below), whose sum is σ = 36361288320. Its totient is φ = 2277015552.

The previous prime is 9961969903. The next prime is 9961969931. The reversal of 9961969920 is 299691699.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 158425 + ... + 212184.

Almost surely, 2^9961969920 is an apocalyptic number.

It is an amenable number.

9961969920 is an abundant number, since it is smaller than the sum of its proper divisors (26399318400).

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

9961969920 is a wasteful number, since it uses less digits than its factorization.

9961969920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370640 (or 370626 counting only the distinct ones).

The product of its (nonzero) digits is 4251528, while the sum is 60.

The square root of 9961969920 is about 99809.6684695426. The cubic root of 9961969920 is about 2151.7001097659.

The spelling of 9961969920 in words is "nine billion, nine hundred sixty-one million, nine hundred sixty-nine thousand, nine hundred twenty".