8193355985 has 4 divisors (see below), whose sum is σ = 9832027188. Its totient is φ = 6554684784.

The previous prime is 8193355967. The next prime is 8193355999. The reversal of 8193355985 is 5895533918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5895533918 = 2 ⋅2947766959.

It can be written as a sum of positive squares in 2 ways, for example, as 1743981121 + 6449374864 = 41761^2 + 80308^2 .

It is a cyclic number.

It is not a de Polignac number, because 8193355985 - 2²⁶ = 8126247121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8193355985.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819335594 + ... + 819335603.

It is an arithmetic number, because the mean of its divisors is an integer number (2458006797).

Almost surely, 2^8193355985 is an apocalyptic number.

It is an amenable number.

8193355985 is a deficient number, since it is larger than the sum of its proper divisors (1638671203).

8193355985 is a wasteful number, since it uses less digits than its factorization.

8193355985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638671202.

The product of its digits is 5832000, while the sum is 56.

The square root of 8193355985 is about 90517.1585115220. The cubic root of 8193355985 is about 2015.9848998702.

The spelling of 8193355985 in words is "eight billion, one hundred ninety-three million, three hundred fifty-five thousand, nine hundred eighty-five".