163856906439 has 16 divisors (see below), whose sum is σ = 220736102400. Its totient is φ = 108110150496.

The previous prime is 163856906407. The next prime is 163856906441. The reversal of 163856906439 is 934609658361.

163856906439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 163856906439 - 2⁵ = 163856906407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163856906449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8119 + ... + 572520.

It is an arithmetic number, because the mean of its divisors is an integer number (13796006400).

Almost surely, 2^163856906439 is an apocalyptic number.

163856906439 is a deficient number, since it is larger than the sum of its proper divisors (56879195961).

163856906439 is a wasteful number, since it uses less digits than its factorization.

163856906439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581614.

The product of its (nonzero) digits is 25194240, while the sum is 60.

The spelling of 163856906439 in words is "one hundred sixty-three billion, eight hundred fifty-six million, nine hundred six thousand, four hundred thirty-nine".