9993643785 has 32 divisors (see below), whose sum is σ = 17896193280. Its totient is φ = 5291028864.

The previous prime is 9993643753. The next prime is 9993643799. The reversal of 9993643785 is 5873463999.

9993643785 is a `hidden beast` number, since 9 + 99 + 36 + 437 + 85 = 666.

9993643785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9993643785 - 2⁵ = 9993643753 is a prime.

It is a super-2 number, since 2×9993643785² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251677 + ... + 288666.

It is an arithmetic number, because the mean of its divisors is an integer number (559256040).

Almost surely, 2^9993643785 is an apocalyptic number.

It is an amenable number.

9993643785 is a deficient number, since it is larger than the sum of its proper divisors (7902549495).

9993643785 is a wasteful number, since it uses less digits than its factorization.

9993643785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540494 (or 540488 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 63.

The square root of 9993643785 is about 99968.2138732107. The cubic root of 9993643785 is about 2153.9781249476.

The spelling of 9993643785 in words is "nine billion, nine hundred ninety-three million, six hundred forty-three thousand, seven hundred eighty-five".