25505145 has 16 divisors (see below), whose sum is σ = 45342720. Its totient is φ = 13602672.

The previous prime is 25505111. The next prime is 25505159. The reversal of 25505145 is 54150552.

It is not a de Polignac number, because 25505145 - 2⁷ = 25505017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 94329 + ... + 94598.

It is an arithmetic number, because the mean of its divisors is an integer number (2833920).

Almost surely, 2^25505145 is an apocalyptic number.

It is an amenable number.

25505145 is a deficient number, since it is larger than the sum of its proper divisors (19837575).

25505145 is a wasteful number, since it uses less digits than its factorization.

25505145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188941 (or 188935 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 25505145 is about 5050.2618743982. The cubic root of 25505145 is about 294.3580602042.

Adding to 25505145 its reverse (54150552), we get a palindrome (79655697).

The spelling of 25505145 in words is "twenty-five million, five hundred five thousand, one hundred forty-five".