9808121864 has 8 divisors (see below), whose sum is σ = 18390228510. Its totient is φ = 4904060928.

The previous prime is 9808121819. The next prime is 9808121887. The reversal of 9808121864 is 4681218089.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6632799364 + 3175322500 = 81442^2 + 56350^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613007609 + ... + 613007624.

Almost surely, 2^9808121864 is an apocalyptic number.

It is an amenable number.

9808121864 is a deficient number, since it is larger than the sum of its proper divisors (8582106646).

9808121864 is a wasteful number, since it uses less digits than its factorization.

9808121864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226015239 (or 1226015235 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 47.

The square root of 9808121864 is about 99035.9624782836. The cubic root of 9808121864 is about 2140.5659742714.

The spelling of 9808121864 in words is "nine billion, eight hundred eight million, one hundred twenty-one thousand, eight hundred sixty-four".