165505042 has 12 divisors (see below), whose sum is σ = 250139610. Its totient is φ = 82129856.

The previous prime is 165505009. The next prime is 165505049. The reversal of 165505042 is 240505561.

It can be written as a sum of positive squares in 3 ways, for example, as 119006281 + 46498761 = 10909^2 + 6819^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 165505042.

It is not an unprimeable number, because it can be changed into a prime (165505049) 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 in 5 ways as a sum of consecutive naturals, for example, 35334 + ... + 39742.

Almost surely, 2^165505042 is an apocalyptic number.

165505042 is a deficient number, since it is larger than the sum of its proper divisors (84634568).

165505042 is an equidigital number, since it uses as much as digits as its factorization.

165505042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685 (or 4548 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 165505042 is about 12864.8762916711. The cubic root of 165505042 is about 549.0396928622.

The spelling of 165505042 in words is "one hundred sixty-five million, five hundred five thousand, forty-two".