168156422639 has 4 divisors (see below), whose sum is σ = 169128425256. Its totient is φ = 167184420024.

The previous prime is 168156422633. The next prime is 168156422689. The reversal of 168156422639 is 936224651861.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168156422639 - 2³⁶ = 99436945903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168156422633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486001049 + ... + 486001394.

It is an arithmetic number, because the mean of its divisors is an integer number (42282106314).

Almost surely, 2^168156422639 is an apocalyptic number.

168156422639 is a deficient number, since it is larger than the sum of its proper divisors (972002617).

168156422639 is an equidigital number, since it uses as much as digits as its factorization.

168156422639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972002616.

The product of its digits is 3732480, while the sum is 53.

The spelling of 168156422639 in words is "one hundred sixty-eight billion, one hundred fifty-six million, four hundred twenty-two thousand, six hundred thirty-nine".