165645525 has 24 divisors (see below), whose sum is σ = 275071680. Its totient is φ = 87955840.

The previous prime is 165645461. The next prime is 165645533. The reversal of 165645525 is 525546561.

It is a happy number.

It is not a de Polignac number, because 165645525 - 2⁶ = 165645461 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 12736 + ... + 22214.

It is an arithmetic number, because the mean of its divisors is an integer number (11461320).

Almost surely, 2^165645525 is an apocalyptic number.

165645525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165645525 is a deficient number, since it is larger than the sum of its proper divisors (109426155).

165645525 is a wasteful number, since it uses less digits than its factorization.

165645525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9725 (or 9720 counting only the distinct ones).

The product of its digits is 180000, while the sum is 39.

The square root of 165645525 is about 12870.3350772231. The cubic root of 165645525 is about 549.1949931264.

The spelling of 165645525 in words is "one hundred sixty-five million, six hundred forty-five thousand, five hundred twenty-five".