25545618 has 56 divisors (see below), whose sum is σ = 65684928. Its totient is φ = 7295832.

The previous prime is 25545613. The next prime is 25545647. The reversal of 25545618 is 81654552.

It is a Curzon number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (25545613) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 8955 + ... + 11457.

Almost surely, 2^25545618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25545618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32842464).

25545618 is an abundant number, since it is smaller than the sum of its proper divisors (40139310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25545618 is an equidigital number, since it uses as much as digits as its factorization.

25545618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530 (or 2515 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 25545618 is about 5054.2673059505. The cubic root of 25545618 is about 294.5136792322.

The spelling of 25545618 in words is "twenty-five million, five hundred forty-five thousand, six hundred eighteen".