9991249668 has 24 divisors (see below), whose sum is σ = 25903240160. Its totient is φ = 3330416520.

The previous prime is 9991249651. The next prime is 9991249691. The reversal of 9991249668 is 8669421999.

It is a super-2 number, since 2×9991249668² (a number of 21 digits) contains 22 as substring.

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, 46255678 + ... + 46255893.

Almost surely, 2^9991249668 is an apocalyptic number.

It is an amenable number.

9991249668 is an abundant number, since it is smaller than the sum of its proper divisors (15911990492).

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

9991249668 is a wasteful number, since it uses less digits than its factorization.

9991249668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92511584 (or 92511576 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 63.

The square root of 9991249668 is about 99956.2387647715. The cubic root of 9991249668 is about 2153.8061060253.

The spelling of 9991249668 in words is "nine billion, nine hundred ninety-one million, two hundred forty-nine thousand, six hundred sixty-eight".