25887618246461 has 2 divisors, whose sum is σ = 25887618246462. Its totient is φ = 25887618246460.

The previous prime is 25887618246449. The next prime is 25887618246463. The reversal of 25887618246461 is 16464281678852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13353221490436 + 12534396756025 = 3654206^2 + 3540395^2 .

It is a cyclic number.

It is not a de Polignac number, because 25887618246461 - 2³⁰ = 25886544504637 is a prime.

Together with 25887618246463, 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 = 25887618246391 and 25887618246400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25887618246463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12943809123230 + 12943809123231.

It is an arithmetic number, because the mean of its divisors is an integer number (12943809123231).

Almost surely, 2^{25887618246461} is an apocalyptic number.

It is an amenable number.

25887618246461 is a deficient number, since it is larger than the sum of its proper divisors (1).

25887618246461 is an equidigital number, since it uses as much as digits as its factorization.

25887618246461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 247726080, while the sum is 68.

The spelling of 25887618246461 in words is "twenty-five trillion, eight hundred eighty-seven billion, six hundred eighteen million, two hundred forty-six thousand, four hundred sixty-one".