25663898251 has 2 divisors, whose sum is σ = 25663898252. Its totient is φ = 25663898250.

The previous prime is 25663898237. The next prime is 25663898263. The reversal of 25663898251 is 15289836652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25663898251 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25663898192 and 25663898201.

It is not a weakly prime, because it can be changed into another prime (25663898231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12831949125 + 12831949126.

It is an arithmetic number, because the mean of its divisors is an integer number (12831949126).

Almost surely, 2^25663898251 is an apocalyptic number.

25663898251 is a deficient number, since it is larger than the sum of its proper divisors (1).

25663898251 is an equidigital number, since it uses as much as digits as its factorization.

25663898251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6220800, while the sum is 55.

The spelling of 25663898251 in words is "twenty-five billion, six hundred sixty-three million, eight hundred ninety-eight thousand, two hundred fifty-one".