25435145545 has 4 divisors (see below), whose sum is σ = 30522174660. Its totient is φ = 20348116432.

The previous prime is 25435145537. The next prime is 25435145557. The reversal of 25435145545 is 54554153452.

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 2757195081 + 22677950464 = 52509^2 + 150592^2 .

It is a cyclic number.

It is not a de Polignac number, because 25435145545 - 2³ = 25435145537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2543514550 + ... + 2543514559.

It is an arithmetic number, because the mean of its divisors is an integer number (7630543665).

Almost surely, 2^25435145545 is an apocalyptic number.

It is an amenable number.

25435145545 is a deficient number, since it is larger than the sum of its proper divisors (5087029115).

25435145545 is an equidigital number, since it uses as much as digits as its factorization.

25435145545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5087029114.

The product of its digits is 1200000, while the sum is 43.

Adding to 25435145545 its reverse (54554153452), we get a palindrome (79989298997).

The spelling of 25435145545 in words is "twenty-five billion, four hundred thirty-five million, one hundred forty-five thousand, five hundred forty-five".