165596909389 has 2 divisors, whose sum is σ = 165596909390. Its totient is φ = 165596909388.

The previous prime is 165596909363. The next prime is 165596909411. The reversal of 165596909389 is 983909695561.

165596909389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84414653764 + 81182255625 = 290542^2 + 284925^2 .

It is a cyclic number.

It is not a de Polignac number, because 165596909389 - 2²¹ = 165594812237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165596409389) 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 as a sum of consecutive naturals, namely, 82798454694 + 82798454695.

It is an arithmetic number, because the mean of its divisors is an integer number (82798454695).

Almost surely, 2^165596909389 is an apocalyptic number.

It is an amenable number.

165596909389 is a deficient number, since it is larger than the sum of its proper divisors (1).

165596909389 is an equidigital number, since it uses as much as digits as its factorization.

165596909389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141717600, while the sum is 70.

The spelling of 165596909389 in words is "one hundred sixty-five billion, five hundred ninety-six million, nine hundred nine thousand, three hundred eighty-nine".