165260399 has 2 divisors, whose sum is σ = 165260400. Its totient is φ = 165260398.

The previous prime is 165260377. The next prime is 165260429. The reversal of 165260399 is 993062561.

It is a weak prime.

It is an emirp because it is prime and its reverse (993062561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165260399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165260099) 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, 82630199 + 82630200.

It is an arithmetic number, because the mean of its divisors is an integer number (82630200).

Almost surely, 2^165260399 is an apocalyptic number.

165260399 is a deficient number, since it is larger than the sum of its proper divisors (1).

165260399 is an equidigital number, since it uses as much as digits as its factorization.

165260399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 165260399 is about 12855.3646000415. The cubic root of 165260399 is about 548.7690365488.

The spelling of 165260399 in words is "one hundred sixty-five million, two hundred sixty thousand, three hundred ninety-nine".