165209357 has 2 divisors, whose sum is σ = 165209358. Its totient is φ = 165209356.

The previous prime is 165209353. The next prime is 165209431. The reversal of 165209357 is 753902561.

It is a happy number.

165209357 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112487236 + 52722121 = 10606^2 + 7261^2 .

It is a cyclic number.

It is not a de Polignac number, because 165209357 - 2² = 165209353 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165209357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165209353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82604678 + 82604679.

It is an arithmetic number, because the mean of its divisors is an integer number (82604679).

Almost surely, 2^165209357 is an apocalyptic number.

It is an amenable number.

165209357 is a deficient number, since it is larger than the sum of its proper divisors (1).

165209357 is an equidigital number, since it uses as much as digits as its factorization.

165209357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 38.

The square root of 165209357 is about 12853.3792054852. The cubic root of 165209357 is about 548.7125334915.

The spelling of 165209357 in words is "one hundred sixty-five million, two hundred nine thousand, three hundred fifty-seven".