9999581091613 has 4 divisors (see below), whose sum is σ = 10005066327168. Its totient is φ = 9994095856060.

The previous prime is 9999581091611. The next prime is 9999581091623. The reversal of 9999581091613 is 3161901859999.

9999581091613 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 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 9999581091613 - 2¹ = 9999581091611 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 (9999581091611) 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, 2742615043 + ... + 2742618688.

It is an arithmetic number, because the mean of its divisors is an integer number (2501266581792).

Almost surely, 2^{9999581091613} is an apocalyptic number.

It is an amenable number.

9999581091613 is a deficient number, since it is larger than the sum of its proper divisors (5485235555).

9999581091613 is a wasteful number, since it uses less digits than its factorization.

9999581091613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5485235554.

The product of its (nonzero) digits is 42515280, while the sum is 70.

The spelling of 9999581091613 in words is "nine trillion, nine hundred ninety-nine billion, five hundred eighty-one million, ninety-one thousand, six hundred thirteen".