9998888660 has 24 divisors (see below), whose sum is σ = 21104261640. Its totient is φ = 3979251584.

The previous prime is 9998888659. The next prime is 9998888671. The reversal of 9998888660 is 668888999.

It can be written as a sum of positive squares in 4 ways, for example, as 1006539076 + 8992349584 = 31726^2 + 94828^2 .

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1264955 + ... + 1272834.

It is an arithmetic number, because the mean of its divisors is an integer number (879344235).

Almost surely, 2^9998888660 is an apocalyptic number.

It is an amenable number.

9998888660 is an abundant number, since it is smaller than the sum of its proper divisors (11105372980).

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

9998888660 is a wasteful number, since it uses less digits than its factorization.

9998888660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2537995 (or 2537993 counting only the distinct ones).

The product of its (nonzero) digits is 107495424, while the sum is 71.

The square root of 9998888660 is about 99994.4431456068. The cubic root of 9998888660 is about 2154.3548767602.

The spelling of 9998888660 in words is "nine billion, nine hundred ninety-eight million, eight hundred eighty-eight thousand, six hundred sixty".