165756424109 has 2 divisors, whose sum is σ = 165756424110. Its totient is φ = 165756424108.

The previous prime is 165756424073. The next prime is 165756424121. The reversal of 165756424109 is 901424657561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156273949225 + 9482474884 = 395315^2 + 97378^2 .

It is a cyclic number.

It is not a de Polignac number, because 165756424109 - 2⁸ = 165756423853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165756424139) 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 as a sum of consecutive naturals, namely, 82878212054 + 82878212055.

It is an arithmetic number, because the mean of its divisors is an integer number (82878212055).

Almost surely, 2^165756424109 is an apocalyptic number.

It is an amenable number.

165756424109 is a deficient number, since it is larger than the sum of its proper divisors (1).

165756424109 is an equidigital number, since it uses as much as digits as its factorization.

165756424109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 165756424109 in words is "one hundred sixty-five billion, seven hundred fifty-six million, four hundred twenty-four thousand, one hundred nine".