25430940641 has 2 divisors, whose sum is σ = 25430940642. Its totient is φ = 25430940640.

The previous prime is 25430940637. The next prime is 25430940643. The reversal of 25430940641 is 14604903452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23672899600 + 1758041041 = 153860^2 + 41929^2 .

It is a cyclic number.

It is not a de Polignac number, because 25430940641 - 2² = 25430940637 is a prime.

Together with 25430940643, 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 = 25430940595 and 25430940604.

It is not a weakly prime, because it can be changed into another prime (25430940643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12715470320 + 12715470321.

It is an arithmetic number, because the mean of its divisors is an integer number (12715470321).

Almost surely, 2^25430940641 is an apocalyptic number.

It is an amenable number.

25430940641 is a deficient number, since it is larger than the sum of its proper divisors (1).

25430940641 is an equidigital number, since it uses as much as digits as its factorization.

25430940641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 25430940641 in words is "twenty-five billion, four hundred thirty million, nine hundred forty thousand, six hundred forty-one".