25110610645 has 4 divisors (see below), whose sum is σ = 30132732780. Its totient is φ = 20088488512.

The previous prime is 25110610643. The next prime is 25110610697. The reversal of 25110610645 is 54601601152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7807312881 + 17303297764 = 88359^2 + 131542^2 .

It is a cyclic number.

It is not a de Polignac number, because 25110610645 - 2¹ = 25110610643 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25110610643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2511061060 + ... + 2511061069.

It is an arithmetic number, because the mean of its divisors is an integer number (7533183195).

Almost surely, 2^25110610645 is an apocalyptic number.

It is an amenable number.

25110610645 is a deficient number, since it is larger than the sum of its proper divisors (5022122135).

25110610645 is an equidigital number, since it uses as much as digits as its factorization.

25110610645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5022122134.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 25110610645 in words is "twenty-five billion, one hundred ten million, six hundred ten thousand, six hundred forty-five".