9975565997 has 4 divisors (see below), whose sum is σ = 10112217660. Its totient is φ = 9838914336.

The previous prime is 9975565993. The next prime is 9975566047. The reversal of 9975565997 is 7995655799.

9975565997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7995655799 = 353 ⋅22650583.

It can be written as a sum of positive squares in 2 ways, for example, as 7650301156 + 2325264841 = 87466^2 + 48221^2 .

It is a cyclic number.

It is not a de Polignac number, because 9975565997 - 2² = 9975565993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9975565997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9975565993) by changing a digit.

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, 68325722 + ... + 68325867.

It is an arithmetic number, because the mean of its divisors is an integer number (2528054415).

Almost surely, 2^9975565997 is an apocalyptic number.

It is an amenable number.

9975565997 is a deficient number, since it is larger than the sum of its proper divisors (136651663).

9975565997 is a wasteful number, since it uses less digits than its factorization.

9975565997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136651662.

The product of its digits is 241116750, while the sum is 71.

The square root of 9975565997 is about 99877.7552661252. The cubic root of 9975565997 is about 2152.6785434753.

The spelling of 9975565997 in words is "nine billion, nine hundred seventy-five million, five hundred sixty-five thousand, nine hundred ninety-seven".