165370409 has 2 divisors, whose sum is σ = 165370410. Its totient is φ = 165370408.

The previous prime is 165370379. The next prime is 165370417. The reversal of 165370409 is 904073561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123832384 + 41538025 = 11128^2 + 6445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165370409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165370489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82685204 + 82685205.

It is an arithmetic number, because the mean of its divisors is an integer number (82685205).

Almost surely, 2^165370409 is an apocalyptic number.

It is an amenable number.

165370409 is a deficient number, since it is larger than the sum of its proper divisors (1).

165370409 is an equidigital number, since it uses as much as digits as its factorization.

165370409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 165370409 is about 12859.6426466679. The cubic root of 165370409 is about 548.8907771299.

The spelling of 165370409 in words is "one hundred sixty-five million, three hundred seventy thousand, four hundred nine".