168208814881 has 4 divisors (see below), whose sum is σ = 168259806000. Its totient is φ = 168157823764.

The previous prime is 168208814857. The next prime is 168208814923. The reversal of 168208814881 is 188418802861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 168208814881 - 2²¹ = 168206717729 is a prime.

It is a super-2 number, since 2×168208814881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168208814581) 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, 25490611 + ... + 25497208.

It is an arithmetic number, because the mean of its divisors is an integer number (42064951500).

Almost surely, 2^168208814881 is an apocalyptic number.

It is an amenable number.

168208814881 is a deficient number, since it is larger than the sum of its proper divisors (50991119).

168208814881 is an equidigital number, since it uses as much as digits as its factorization.

168208814881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50991118.

The product of its (nonzero) digits is 1572864, while the sum is 55.

The spelling of 168208814881 in words is "one hundred sixty-eight billion, two hundred eight million, eight hundred fourteen thousand, eight hundred eighty-one".