9917665537 has 4 divisors (see below), whose sum is σ = 10680562900. Its totient is φ = 9154768176.

The previous prime is 9917665531. The next prime is 9917665591. The reversal of 9917665537 is 7355667199.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7355667199 = 6151 ⋅1195849.

It can be written as a sum of positive squares in 2 ways, for example, as 4779786496 + 5137879041 = 69136^2 + 71679^2 .

It is a cyclic number.

It is not a de Polignac number, because 9917665537 - 2³ = 9917665529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9917665531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381448662 + ... + 381448687.

It is an arithmetic number, because the mean of its divisors is an integer number (2670140725).

Almost surely, 2^9917665537 is an apocalyptic number.

It is an amenable number.

9917665537 is a deficient number, since it is larger than the sum of its proper divisors (762897363).

9917665537 is a wasteful number, since it uses less digits than its factorization.

9917665537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762897362.

The product of its digits is 10716300, while the sum is 58.

The square root of 9917665537 is about 99587.4768080806. The cubic root of 9917665537 is about 2148.5055803581.

The spelling of 9917665537 in words is "nine billion, nine hundred seventeen million, six hundred sixty-five thousand, five hundred thirty-seven".