9991716375 has 64 divisors (see below), whose sum is σ = 17114872320. Its totient is φ = 5174528000.

The previous prime is 9991716349. The next prime is 9991716421. The reversal of 9991716375 is 5736171999.

It is not a de Polignac number, because 9991716375 - 2⁶ = 9991716311 is a prime.

It is a super-2 number, since 2×9991716375² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1833655 + ... + 1839095.

It is an arithmetic number, because the mean of its divisors is an integer number (267419880).

Almost surely, 2^9991716375 is an apocalyptic number.

9991716375 is a deficient number, since it is larger than the sum of its proper divisors (7123155945).

9991716375 is a wasteful number, since it uses less digits than its factorization.

9991716375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5601 (or 5591 counting only the distinct ones).

The product of its digits is 3214890, while the sum is 57.

The square root of 9991716375 is about 99958.5732941402. The cubic root of 9991716375 is about 2153.8396413943.

The spelling of 9991716375 in words is "nine billion, nine hundred ninety-one million, seven hundred sixteen thousand, three hundred seventy-five".