25643545 has 8 divisors (see below), whose sum is σ = 30800520. Its totient is φ = 20496000.

The previous prime is 25643543. The next prime is 25643557. The reversal of 25643545 is 54534652.

It can be written as a sum of positive squares in 4 ways, for example, as 753424 + 24890121 = 868^2 + 4989^2 .

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

It is not a de Polignac number, because 25643545 - 2¹ = 25643543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25643545.

It is not an unprimeable number, because it can be changed into a prime (25643543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7045 + ... + 10045.

It is an arithmetic number, because the mean of its divisors is an integer number (3850065).

Almost surely, 2^25643545 is an apocalyptic number.

It is an amenable number.

25643545 is a deficient number, since it is larger than the sum of its proper divisors (5156975).

25643545 is a wasteful number, since it uses less digits than its factorization.

25643545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4715.

The product of its digits is 72000, while the sum is 34.

The square root of 25643545 is about 5063.9455960743. The cubic root of 25643545 is about 294.8895305995.

The spelling of 25643545 in words is "twenty-five million, six hundred forty-three thousand, five hundred forty-five".