9965567281 has 4 divisors (see below), whose sum is σ = 10002340864. Its totient is φ = 9928793700.

The previous prime is 9965567273. The next prime is 9965567291. The reversal of 9965567281 is 1827655699.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9965567281 - 2³ = 9965567273 is a prime.

It is a super-2 number, since 2×9965567281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9965567231) 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, 18386385 + ... + 18386926.

It is an arithmetic number, because the mean of its divisors is an integer number (2500585216).

Almost surely, 2^9965567281 is an apocalyptic number.

It is an amenable number.

9965567281 is a deficient number, since it is larger than the sum of its proper divisors (36773583).

9965567281 is a wasteful number, since it uses less digits than its factorization.

9965567281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36773582.

The product of its digits is 8164800, while the sum is 58.

The square root of 9965567281 is about 99827.6879477833. The cubic root of 9965567281 is about 2151.9590783097.

The spelling of 9965567281 in words is "nine billion, nine hundred sixty-five million, five hundred sixty-seven thousand, two hundred eighty-one".