9991768508 has 12 divisors (see below), whose sum is σ = 17573463600. Its totient is φ = 4970778912.

The previous prime is 9991768477. The next prime is 9991768517. The reversal of 9991768508 is 8058671999.

9991768508 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6275441 + ... + 6277032.

It is an arithmetic number, because the mean of its divisors is an integer number (1464455300).

Almost surely, 2^9991768508 is an apocalyptic number.

It is an amenable number.

9991768508 is a deficient number, since it is larger than the sum of its proper divisors (7581695092).

9991768508 is a wasteful number, since it uses less digits than its factorization.

9991768508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12552676 (or 12552674 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 62.

The square root of 9991768508 is about 99958.8340668297. The cubic root of 9991768508 is about 2153.8433873616.

The spelling of 9991768508 in words is "nine billion, nine hundred ninety-one million, seven hundred sixty-eight thousand, five hundred eight".