9999536399 has 4 divisors (see below), whose sum is σ = 9999785136. Its totient is φ = 9999287664.

The previous prime is 9999536383. The next prime is 9999536401. The reversal of 9999536399 is 9936359999.

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: 9936359999 = 3889 ⋅2554991.

It is a cyclic number.

It is not a de Polignac number, because 9999536399 - 2⁴ = 9999536383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999536329) 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, 48734 + ... + 149579.

It is an arithmetic number, because the mean of its divisors is an integer number (2499946284).

Almost surely, 2^9999536399 is an apocalyptic number.

9999536399 is a deficient number, since it is larger than the sum of its proper divisors (248737).

9999536399 is a wasteful number, since it uses less digits than its factorization.

9999536399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248736.

The product of its digits is 143489070, while the sum is 71.

The square root of 9999536399 is about 99997.6819681336. The cubic root of 9999536399 is about 2154.4013962482.

The spelling of 9999536399 in words is "nine billion, nine hundred ninety-nine million, five hundred thirty-six thousand, three hundred ninety-nine".