165208613 has 2 divisors, whose sum is σ = 165208614. Its totient is φ = 165208612.

The previous prime is 165208583. The next prime is 165208627. The reversal of 165208613 is 316802561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156925729 + 8282884 = 12527^2 + 2878^2 .

It is a cyclic number.

It is not a de Polignac number, because 165208613 - 2¹² = 165204517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165208613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165208643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82604306 + 82604307.

It is an arithmetic number, because the mean of its divisors is an integer number (82604307).

Almost surely, 2^165208613 is an apocalyptic number.

It is an amenable number.

165208613 is a deficient number, since it is larger than the sum of its proper divisors (1).

165208613 is an equidigital number, since it uses as much as digits as its factorization.

165208613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 165208613 is about 12853.3502636472. The cubic root of 165208613 is about 548.7117098038.

The spelling of 165208613 in words is "one hundred sixty-five million, two hundred eight thousand, six hundred thirteen".