8168590993 has 4 divisors (see below), whose sum is σ = 8169101028. Its totient is φ = 8168080960.

The previous prime is 8168590949. The next prime is 8168590999. The reversal of 8168590993 is 3990958618.

8168590993 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 7891301889 + 277289104 = 88833^2 + 16652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8168590993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8168590999) 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, 230188 + ... + 263293.

It is an arithmetic number, because the mean of its divisors is an integer number (2042275257).

Almost surely, 2^8168590993 is an apocalyptic number.

It is an amenable number.

8168590993 is a deficient number, since it is larger than the sum of its proper divisors (510035).

8168590993 is a wasteful number, since it uses less digits than its factorization.

8168590993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510034.

The product of its (nonzero) digits is 4199040, while the sum is 58.

The square root of 8168590993 is about 90380.2577613054. The cubic root of 8168590993 is about 2013.9516981678.

The spelling of 8168590993 in words is "eight billion, one hundred sixty-eight million, five hundred ninety thousand, nine hundred ninety-three".