165395899 has 2 divisors, whose sum is σ = 165395900. Its totient is φ = 165395898.

The previous prime is 165395897. The next prime is 165395911. The reversal of 165395899 is 998593561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165395899 - 2¹ = 165395897 is a prime.

Together with 165395897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (165395891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82697949 + 82697950.

It is an arithmetic number, because the mean of its divisors is an integer number (82697950).

Almost surely, 2^165395899 is an apocalyptic number.

165395899 is a deficient number, since it is larger than the sum of its proper divisors (1).

165395899 is an equidigital number, since it uses as much as digits as its factorization.

165395899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2624400, while the sum is 55.

The square root of 165395899 is about 12860.6336935627. The cubic root of 165395899 is about 548.9189774736.

The spelling of 165395899 in words is "one hundred sixty-five million, three hundred ninety-five thousand, eight hundred ninety-nine".