165256045 has 4 divisors (see below), whose sum is σ = 198307260. Its totient is φ = 132204832.

The previous prime is 165256033. The next prime is 165256051. The reversal of 165256045 is 540652561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19474569 + 145781476 = 4413^2 + 12074^2 .

It is a cyclic number.

It is not a de Polignac number, because 165256045 - 2⁷ = 165255917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165256045.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16525600 + ... + 16525609.

It is an arithmetic number, because the mean of its divisors is an integer number (49576815).

Almost surely, 2^165256045 is an apocalyptic number.

It is an amenable number.

165256045 is a deficient number, since it is larger than the sum of its proper divisors (33051215).

165256045 is an equidigital number, since it uses as much as digits as its factorization.

165256045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33051214.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 165256045 is about 12855.1952532818. The cubic root of 165256045 is about 548.7642171620.

The spelling of 165256045 in words is "one hundred sixty-five million, two hundred fifty-six thousand, forty-five".