168505613 has 8 divisors (see below), whose sum is σ = 180121536. Its totient is φ = 157247200.

The previous prime is 168505549. The next prime is 168505619. The reversal of 168505613 is 316505861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168505613 - 2⁶ = 168505549 is a prime.

It is a super-2 number, since 2×168505613² = 56788283225011538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168505619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88403 + ... + 90288.

It is an arithmetic number, because the mean of its divisors is an integer number (22515192).

Almost surely, 2^168505613 is an apocalyptic number.

It is an amenable number.

168505613 is a deficient number, since it is larger than the sum of its proper divisors (11615923).

168505613 is a wasteful number, since it uses less digits than its factorization.

168505613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178755.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 168505613 is about 12980.9711886284. The cubic root of 168505613 is about 552.3378316462.

The spelling of 168505613 in words is "one hundred sixty-eight million, five hundred five thousand, six hundred thirteen".