165504513 has 4 divisors (see below), whose sum is σ = 220672688. Its totient is φ = 110336340.

The previous prime is 165504491. The next prime is 165504523. The reversal of 165504513 is 315405561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 165504513 - 2¹⁰ = 165503489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165504523) 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 3 ways as a sum of consecutive naturals, for example, 27584083 + ... + 27584088.

It is an arithmetic number, because the mean of its divisors is an integer number (55168172).

Almost surely, 2^165504513 is an apocalyptic number.

It is an amenable number.

165504513 is a deficient number, since it is larger than the sum of its proper divisors (55168175).

165504513 is an equidigital number, since it uses as much as digits as its factorization.

165504513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55168174.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 165504513 is about 12864.8557317989. The cubic root of 165504513 is about 549.0391079005.

The spelling of 165504513 in words is "one hundred sixty-five million, five hundred four thousand, five hundred thirteen".