1605122165 has 8 divisors (see below), whose sum is σ = 1928655960. Its totient is φ = 1282424832.

The previous prime is 1605122153. The next prime is 1605122191. The reversal of 1605122165 is 5612215061.

It is a happy number.

1605122165 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 28793956 + 1576328209 = 5366^2 + 39703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1605122165 - 2¹⁴ = 1605105781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204884 + ... + 212573.

It is an arithmetic number, because the mean of its divisors is an integer number (241081995).

Almost surely, 2^1605122165 is an apocalyptic number.

It is an amenable number.

1605122165 is a deficient number, since it is larger than the sum of its proper divisors (323533795).

1605122165 is an equidigital number, since it uses as much as digits as its factorization.

1605122165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418231.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1605122165 is about 40063.9759010511. The cubic root of 1605122165 is about 1170.8538742134.

The spelling of 1605122165 in words is "one billion, six hundred five million, one hundred twenty-two thousand, one hundred sixty-five".