25665850291 has 2 divisors, whose sum is σ = 25665850292. Its totient is φ = 25665850290.

The previous prime is 25665850253. The next prime is 25665850297. The reversal of 25665850291 is 19205856652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25665850291 - 2⁷ = 25665850163 is a prime.

It is not a weakly prime, because it can be changed into another prime (25665850297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12832925145 + 12832925146.

It is an arithmetic number, because the mean of its divisors is an integer number (12832925146).

Almost surely, 2^25665850291 is an apocalyptic number.

25665850291 is a deficient number, since it is larger than the sum of its proper divisors (1).

25665850291 is an equidigital number, since it uses as much as digits as its factorization.

25665850291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 25665850291 in words is "twenty-five billion, six hundred sixty-five million, eight hundred fifty thousand, two hundred ninety-one".