9991617152 has 32 divisors (see below), whose sum is σ = 21714739200. Its totient is φ = 4541643520.

The previous prime is 9991617143. The next prime is 9991617157. The reversal of 9991617152 is 2517161999.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×9991617152² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9991617152.

It is not an unprimeable number, because it can be changed into a prime (9991617157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3546752 + ... + 3549567.

It is an arithmetic number, because the mean of its divisors is an integer number (678585600).

Almost surely, 2^9991617152 is an apocalyptic number.

It is an amenable number.

9991617152 is an abundant number, since it is smaller than the sum of its proper divisors (11723122048).

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

9991617152 is a wasteful number, since it uses less digits than its factorization.

9991617152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7096344 (or 7096332 counting only the distinct ones).

The product of its digits is 306180, while the sum is 50.

The square root of 9991617152 is about 99958.0769722987. The cubic root of 9991617152 is about 2153.8325117838.

The spelling of 9991617152 in words is "nine billion, nine hundred ninety-one million, six hundred seventeen thousand, one hundred fifty-two".