9975528809 has 2 divisors, whose sum is σ = 9975528810. Its totient is φ = 9975528808.

The previous prime is 9975528803. The next prime is 9975528811. The reversal of 9975528809 is 9088255799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5134152409 + 4841376400 = 71653^2 + 69580^2 .

It is a cyclic number.

It is not a de Polignac number, because 9975528809 - 2⁴ = 9975528793 is a prime.

It is a super-2 number, since 2×9975528809² (a number of 21 digits) contains 22 as substring.

Together with 9975528811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9975528803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4987764404 + 4987764405.

It is an arithmetic number, because the mean of its divisors is an integer number (4987764405).

Almost surely, 2^9975528809 is an apocalyptic number.

It is an amenable number.

9975528809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9975528809 is an equidigital number, since it uses as much as digits as its factorization.

9975528809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16329600, while the sum is 62.

The square root of 9975528809 is about 99877.5690983716. The cubic root of 9975528809 is about 2152.6758684756.

The spelling of 9975528809 in words is "nine billion, nine hundred seventy-five million, five hundred twenty-eight thousand, eight hundred nine".