165444027109 has 2 divisors, whose sum is σ = 165444027110. Its totient is φ = 165444027108.

The previous prime is 165444027103. The next prime is 165444027113. The reversal of 165444027109 is 901720444561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165408957025 + 35070084 = 406705^2 + 5922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165444027109 is a prime.

It is a super-4 number, since 4×165444027109⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165444027103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82722013554 + 82722013555.

It is an arithmetic number, because the mean of its divisors is an integer number (82722013555).

Almost surely, 2^165444027109 is an apocalyptic number.

It is an amenable number.

165444027109 is a deficient number, since it is larger than the sum of its proper divisors (1).

165444027109 is an equidigital number, since it uses as much as digits as its factorization.

165444027109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 165444027109 in words is "one hundred sixty-five billion, four hundred forty-four million, twenty-seven thousand, one hundred nine".