168555540613 has 4 divisors (see below), whose sum is σ = 168610825900. Its totient is φ = 168500255328.

The previous prime is 168555540589. The next prime is 168555540623. The reversal of 168555540613 is 316045555861.

It is a happy number.

168555540613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 53334669249 + 115220871364 = 230943^2 + 339442^2 .

It is a cyclic number.

It is not a de Polignac number, because 168555540613 - 2³⁷ = 31116587141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168555540623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27638070 + ... + 27644167.

It is an arithmetic number, because the mean of its divisors is an integer number (42152706475).

Almost surely, 2^168555540613 is an apocalyptic number.

It is an amenable number.

168555540613 is a deficient number, since it is larger than the sum of its proper divisors (55285287).

168555540613 is an equidigital number, since it uses as much as digits as its factorization.

168555540613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55285286.

The product of its (nonzero) digits is 2160000, while the sum is 49.

The spelling of 168555540613 in words is "one hundred sixty-eight billion, five hundred fifty-five million, five hundred forty thousand, six hundred thirteen".