165623025 has 24 divisors (see below), whose sum is σ = 274562784. Its totient is φ = 88096000.

The previous prime is 165623021. The next prime is 165623041. The reversal of 165623025 is 520326561.

It is not a de Polignac number, because 165623025 - 2² = 165623021 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 165622983 and 165623001.

It is not an unprimeable number, because it can be changed into a prime (165623021) by changing a digit.

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, 27322 + ... + 32828.

It is an arithmetic number, because the mean of its divisors is an integer number (11440116).

Almost surely, 2^165623025 is an apocalyptic number.

165623025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165623025 is a deficient number, since it is larger than the sum of its proper divisors (108939759).

165623025 is a wasteful number, since it uses less digits than its factorization.

165623025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5921 (or 5916 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 165623025 is about 12869.4609444219. The cubic root of 165623025 is about 549.1701258747.

Adding to 165623025 its reverse (520326561), we get a palindrome (685949586).

The spelling of 165623025 in words is "one hundred sixty-five million, six hundred twenty-three thousand, twenty-five".