168491358361 has 4 divisors (see below), whose sum is σ = 170228382772. Its totient is φ = 166754333952.

The previous prime is 168491358257. The next prime is 168491358391. The reversal of 168491358361 is 163853194861.

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 140011420761 + 28479937600 = 374181^2 + 168760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168491358361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168491358391) 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, 868512060 + ... + 868512253.

It is an arithmetic number, because the mean of its divisors is an integer number (42557095693).

Almost surely, 2^168491358361 is an apocalyptic number.

It is an amenable number.

168491358361 is a deficient number, since it is larger than the sum of its proper divisors (1737024411).

168491358361 is an equidigital number, since it uses as much as digits as its factorization.

168491358361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737024410.

The product of its digits is 3732480, while the sum is 55.

The spelling of 168491358361 in words is "one hundred sixty-eight billion, four hundred ninety-one million, three hundred fifty-eight thousand, three hundred sixty-one".