165434861 has 2 divisors, whose sum is σ = 165434862. Its totient is φ = 165434860.

The previous prime is 165434833. The next prime is 165434873. The reversal of 165434861 is 168434561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153908836 + 11526025 = 12406^2 + 3395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165434861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165434161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82717430 + 82717431.

It is an arithmetic number, because the mean of its divisors is an integer number (82717431).

Almost surely, 2^165434861 is an apocalyptic number.

It is an amenable number.

165434861 is a deficient number, since it is larger than the sum of its proper divisors (1).

165434861 is an equidigital number, since it uses as much as digits as its factorization.

165434861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 38.

The square root of 165434861 is about 12862.1483819773. The cubic root of 165434861 is about 548.9620766923.

The spelling of 165434861 in words is "one hundred sixty-five million, four hundred thirty-four thousand, eight hundred sixty-one".