25646976541 has 2 divisors, whose sum is σ = 25646976542. Its totient is φ = 25646976540.

The previous prime is 25646976539. The next prime is 25646976581. The reversal of 25646976541 is 14567964652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25646741316 + 235225 = 160146^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 25646976541 - 2¹ = 25646976539 is a prime.

Together with 25646976539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25646976581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12823488270 + 12823488271.

It is an arithmetic number, because the mean of its divisors is an integer number (12823488271).

Almost surely, 2^25646976541 is an apocalyptic number.

It is an amenable number.

25646976541 is a deficient number, since it is larger than the sum of its proper divisors (1).

25646976541 is an equidigital number, since it uses as much as digits as its factorization.

25646976541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10886400, while the sum is 55.

The spelling of 25646976541 in words is "twenty-five billion, six hundred forty-six million, nine hundred seventy-six thousand, five hundred forty-one".