168618091 has 8 divisors (see below), whose sum is σ = 172698768. Its totient is φ = 164580000.

The previous prime is 168618071. The next prime is 168618119. The reversal of 168618091 is 190816861.

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 168618091 - 2¹⁷ = 168487019 is a prime.

It is a super-2 number, since 2×168618091² = 56864121224968562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168618001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2560 + ... + 18541.

It is an arithmetic number, because the mean of its divisors is an integer number (21587346).

Almost surely, 2^168618091 is an apocalyptic number.

168618091 is a deficient number, since it is larger than the sum of its proper divisors (4080677).

168618091 is a wasteful number, since it uses less digits than its factorization.

168618091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21293.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 168618091 is about 12985.3028844151. The cubic root of 168618091 is about 552.4607000294.

The spelling of 168618091 in words is "one hundred sixty-eight million, six hundred eighteen thousand, ninety-one".