168618689 has 6 divisors (see below), whose sum is σ = 170384454. Its totient is φ = 166871040.

The previous prime is 168618683. The next prime is 168618739. The reversal of 168618689 is 986816861.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8464 + 168610225 = 92^2 + 12985^2 .

It is not a de Polignac number, because 168618689 - 2⁸ = 168618433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 168618689.

It is not an unprimeable number, because it can be changed into a prime (168618683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 449 + ... + 18369.

It is an arithmetic number, because the mean of its divisors is an integer number (28397409).

Almost surely, 2^168618689 is an apocalyptic number.

It is an amenable number.

168618689 is a deficient number, since it is larger than the sum of its proper divisors (1765765).

168618689 is an frugal number, since it uses more digits than its factorization.

168618689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18115 (or 18018 counting only the distinct ones).

The product of its digits is 995328, while the sum is 53.

The square root of 168618689 is about 12985.3259104267. The cubic root of 168618689 is about 552.4613531248.

The spelling of 168618689 in words is "one hundred sixty-eight million, six hundred eighteen thousand, six hundred eighty-nine".