168806497393 has 4 divisors (see below), whose sum is σ = 170546770660. Its totient is φ = 167066224128.

The previous prime is 168806497357. The next prime is 168806497403. The reversal of 168806497393 is 393794608861.

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: 393794608861 = 223 ⋅1765895107.

It can be written as a sum of positive squares in 2 ways, for example, as 40711939984 + 128094557409 = 201772^2 + 357903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168806497393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168806497493) 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, 870136488 + ... + 870136681.

It is an arithmetic number, because the mean of its divisors is an integer number (42636692665).

Almost surely, 2^168806497393 is an apocalyptic number.

It is an amenable number.

168806497393 is a deficient number, since it is larger than the sum of its proper divisors (1740273267).

168806497393 is an equidigital number, since it uses as much as digits as its factorization.

168806497393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740273266.

The product of its (nonzero) digits is 47029248, while the sum is 64.

The spelling of 168806497393 in words is "one hundred sixty-eight billion, eight hundred six million, four hundred ninety-seven thousand, three hundred ninety-three".