9969981680 has 20 divisors (see below), whose sum is σ = 23180207592. Its totient is φ = 3987992640.

The previous prime is 9969981673. The next prime is 9969981727. The reversal of 9969981680 is 861899699.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62312306 + ... + 62312465.

Almost surely, 2^9969981680 is an apocalyptic number.

It is an amenable number.

9969981680 is an abundant number, since it is smaller than the sum of its proper divisors (13210225912).

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

9969981680 is a wasteful number, since it uses less digits than its factorization.

9969981680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124624784 (or 124624778 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 65.

The square root of 9969981680 is about 99849.7955931809. The cubic root of 9969981680 is about 2152.2767790291.

The spelling of 9969981680 in words is "nine billion, nine hundred sixty-nine million, nine hundred eighty-one thousand, six hundred eighty".