168056639 has 2 divisors, whose sum is σ = 168056640. Its totient is φ = 168056638.

The previous prime is 168056597. The next prime is 168056641. The reversal of 168056639 is 936650861.

168056639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (936650861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168056639 - 2¹² = 168052543 is a prime.

It is a Sophie Germain prime.

Together with 168056641, 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 168056639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168056939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84028319 + 84028320.

It is an arithmetic number, because the mean of its divisors is an integer number (84028320).

Almost surely, 2^168056639 is an apocalyptic number.

168056639 is a deficient number, since it is larger than the sum of its proper divisors (1).

168056639 is an equidigital number, since it uses as much as digits as its factorization.

168056639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 168056639 is about 12963.6661095540. Note that the first 3 decimals coincide. The cubic root of 168056639 is about 551.8468373195.

The spelling of 168056639 in words is "one hundred sixty-eight million, fifty-six thousand, six hundred thirty-nine".