168555555861 has 32 divisors (see below), whose sum is σ = 280219112448. Its totient is φ = 87554183040.

The previous prime is 168555555859. The next prime is 168555555887.

168555555861 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 168555555861 - 2¹ = 168555555859 is a prime.

It is a super-2 number, since 2×168555555861² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 168555555795 and 168555555804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168555550861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3965226 + ... + 4007508.

It is an arithmetic number, because the mean of its divisors is an integer number (8756847264).

Almost surely, 2^168555555861 is an apocalyptic number.

168555555861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

168555555861 is a deficient number, since it is larger than the sum of its proper divisors (111663556587).

168555555861 is a wasteful number, since it uses less digits than its factorization.

168555555861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59561.

The product of its digits is 36000000, while the sum is 60.

The spelling of 168555555861 in words is "one hundred sixty-eight billion, five hundred fifty-five million, five hundred fifty-five thousand, eight hundred sixty-one".