165765253 has 4 divisors (see below), whose sum is σ = 174489760. Its totient is φ = 157040748.

The previous prime is 165765251. The next prime is 165765289. The reversal of 165765253 is 352567561.

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 a cyclic number.

It is not a de Polignac number, because 165765253 - 2¹ = 165765251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165765251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4362225 + ... + 4362262.

It is an arithmetic number, because the mean of its divisors is an integer number (43622440).

Almost surely, 2^165765253 is an apocalyptic number.

It is an amenable number.

165765253 is a deficient number, since it is larger than the sum of its proper divisors (8724507).

165765253 is an equidigital number, since it uses as much as digits as its factorization.

165765253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8724506.

The product of its digits is 189000, while the sum is 40.

The square root of 165765253 is about 12874.9855533900. The cubic root of 165765253 is about 549.3272799926.

The spelling of 165765253 in words is "one hundred sixty-five million, seven hundred sixty-five thousand, two hundred fifty-three".