165844387 has 2 divisors, whose sum is σ = 165844388. Its totient is φ = 165844386.

The previous prime is 165844361. The next prime is 165844403. The reversal of 165844387 is 783448561.

It is a happy number.

165844387 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165844387 is a prime.

It is not a weakly prime, because it can be changed into another prime (165844307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82922193 + 82922194.

It is an arithmetic number, because the mean of its divisors is an integer number (82922194).

Almost surely, 2^165844387 is an apocalyptic number.

165844387 is a deficient number, since it is larger than the sum of its proper divisors (1).

165844387 is an equidigital number, since it uses as much as digits as its factorization.

165844387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 46.

The square root of 165844387 is about 12878.0583552025. The cubic root of 165844387 is about 549.4146797917.

The spelling of 165844387 in words is "one hundred sixty-five million, eight hundred forty-four thousand, three hundred eighty-seven".