168156422689 has 2 divisors, whose sum is σ = 168156422690. Its totient is φ = 168156422688.

The previous prime is 168156422633. The next prime is 168156422701. The reversal of 168156422689 is 986224651861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137060627089 + 31095795600 = 370217^2 + 176340^2 .

It is a cyclic number.

It is not a de Polignac number, because 168156422689 - 2²⁵ = 168122868257 is a prime.

It is not a weakly prime, because it can be changed into another prime (168156722689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84078211344 + 84078211345.

It is an arithmetic number, because the mean of its divisors is an integer number (84078211345).

Almost surely, 2^168156422689 is an apocalyptic number.

It is an amenable number.

168156422689 is a deficient number, since it is larger than the sum of its proper divisors (1).

168156422689 is an equidigital number, since it uses as much as digits as its factorization.

168156422689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 58.

The spelling of 168156422689 in words is "one hundred sixty-eight billion, one hundred fifty-six million, four hundred twenty-two thousand, six hundred eighty-nine".