25641645 has 8 divisors (see below), whose sum is σ = 41026656. Its totient is φ = 13675536.

The previous prime is 25641643. The next prime is 25641647. The reversal of 25641645 is 54614652.

It is an interprime number because it is at equal distance from previous prime (25641643) and next prime (25641647).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25641645 - 2¹ = 25641643 is a prime.

It is a super-3 number, since 3×25641645³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25641643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854707 + ... + 854736.

It is an arithmetic number, because the mean of its divisors is an integer number (5128332).

Almost surely, 2^25641645 is an apocalyptic number.

It is an amenable number.

25641645 is a deficient number, since it is larger than the sum of its proper divisors (15385011).

25641645 is a wasteful number, since it uses less digits than its factorization.

25641645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709451.

The product of its digits is 28800, while the sum is 33.

The square root of 25641645 is about 5063.7579918476. The cubic root of 25641645 is about 294.8822473638.

The spelling of 25641645 in words is "twenty-five million, six hundred forty-one thousand, six hundred forty-five".