168662159881 has 4 divisors (see below), whose sum is σ = 169990208512. Its totient is φ = 167334111252.

The previous prime is 168662159879. The next prime is 168662159917. The reversal of 168662159881 is 188951266861.

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 168662159881 - 2¹ = 168662159879 is a prime.

It is a super-2 number, since 2×168662159881² (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 (168662159681) 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, 664024125 + ... + 664024378.

It is an arithmetic number, because the mean of its divisors is an integer number (42497552128).

Almost surely, 2^168662159881 is an apocalyptic number.

It is an amenable number.

168662159881 is a deficient number, since it is larger than the sum of its proper divisors (1328048631).

168662159881 is a wasteful number, since it uses less digits than its factorization.

168662159881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328048630.

The product of its digits is 9953280, while the sum is 61.

The spelling of 168662159881 in words is "one hundred sixty-eight billion, six hundred sixty-two million, one hundred fifty-nine thousand, eight hundred eighty-one".