168018437 has 2 divisors, whose sum is σ = 168018438. Its totient is φ = 168018436.

The previous prime is 168018407. The next prime is 168018439. The reversal of 168018437 is 734810861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147233956 + 20784481 = 12134^2 + 4559^2 .

It is a cyclic number.

It is not a de Polignac number, because 168018437 - 2¹⁴ = 168002053 is a prime.

Together with 168018439, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168018437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168018439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84009218 + 84009219.

It is an arithmetic number, because the mean of its divisors is an integer number (84009219).

Almost surely, 2^168018437 is an apocalyptic number.

It is an amenable number.

168018437 is a deficient number, since it is larger than the sum of its proper divisors (1).

168018437 is an equidigital number, since it uses as much as digits as its factorization.

168018437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 168018437 is about 12962.1926000195. The cubic root of 168018437 is about 551.8050195716.

The spelling of 168018437 in words is "one hundred sixty-eight million, eighteen thousand, four hundred thirty-seven".