25131404345 has 4 divisors (see below), whose sum is σ = 30157685220. Its totient is φ = 20105123472.

The previous prime is 25131404327. The next prime is 25131404359. The reversal of 25131404345 is 54340413152.

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 5195093929 + 19936310416 = 72077^2 + 141196^2 .

It is a cyclic number.

It is not a de Polignac number, because 25131404345 - 2²⁴ = 25114627129 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, 2513140430 + ... + 2513140439.

It is an arithmetic number, because the mean of its divisors is an integer number (7539421305).

Almost surely, 2^25131404345 is an apocalyptic number.

It is an amenable number.

25131404345 is a deficient number, since it is larger than the sum of its proper divisors (5026280875).

25131404345 is an equidigital number, since it uses as much as digits as its factorization.

25131404345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5026280874.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 25131404345 its reverse (54340413152), we get a palindrome (79471817497).

The spelling of 25131404345 in words is "twenty-five billion, one hundred thirty-one million, four hundred four thousand, three hundred forty-five".