25013406641 has 2 divisors, whose sum is σ = 25013406642. Its totient is φ = 25013406640.

The previous prime is 25013406623. The next prime is 25013406643. The reversal of 25013406641 is 14660431052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23919715600 + 1093691041 = 154660^2 + 33071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25013406641 is a prime.

Together with 25013406643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25013406598 and 25013406607.

It is not a weakly prime, because it can be changed into another prime (25013406643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12506703320 + 12506703321.

It is an arithmetic number, because the mean of its divisors is an integer number (12506703321).

Almost surely, 2^25013406641 is an apocalyptic number.

It is an amenable number.

25013406641 is a deficient number, since it is larger than the sum of its proper divisors (1).

25013406641 is an equidigital number, since it uses as much as digits as its factorization.

25013406641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 25013406641 its reverse (14660431052), we get a palindrome (39673837693).

The spelling of 25013406641 in words is "twenty-five billion, thirteen million, four hundred six thousand, six hundred forty-one".