25505645 has 16 divisors (see below), whose sum is σ = 34542720. Its totient is φ = 17908800.

The previous prime is 25505639. The next prime is 25505647. The reversal of 25505645 is 54650552.

It is not a de Polignac number, because 25505645 - 2⁴ = 25505629 is a prime.

It is a super-3 number, since 3×25505645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25505647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6401 + ... + 9590.

It is an arithmetic number, because the mean of its divisors is an integer number (2158920).

Almost surely, 2^25505645 is an apocalyptic number.

It is an amenable number.

25505645 is a deficient number, since it is larger than the sum of its proper divisors (9037075).

25505645 is a wasteful number, since it uses less digits than its factorization.

25505645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16036.

The product of its (nonzero) digits is 30000, while the sum is 32.

The square root of 25505645 is about 5050.3113765391. The cubic root of 25505645 is about 294.3599837124.

The spelling of 25505645 in words is "twenty-five million, five hundred five thousand, six hundred forty-five".