16505025 has 24 divisors (see below), whose sum is σ = 27408960. Its totient is φ = 8763840.

The previous prime is 16505023. The next prime is 16505039. The reversal of 16505025 is 52050561.

It is not a de Polignac number, because 16505025 - 2¹ = 16505023 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16504986 and 16505004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26619 + ... + 27231.

It is an arithmetic number, because the mean of its divisors is an integer number (1142040).

Almost surely, 2^16505025 is an apocalyptic number.

16505025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16505025 is a deficient number, since it is larger than the sum of its proper divisors (10903935).

16505025 is a wasteful number, since it uses less digits than its factorization.

16505025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 16505025 is about 4062.6376899743. The cubic root of 16505025 is about 254.6080098073.

Adding to 16505025 its reverse (52050561), we get a palindrome (68555586).

The spelling of 16505025 in words is "sixteen million, five hundred five thousand, twenty-five".