25105565497 has 2 divisors, whose sum is σ = 25105565498. Its totient is φ = 25105565496.

The previous prime is 25105565491. The next prime is 25105565531. The reversal of 25105565497 is 79456550152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14618986281 + 10486579216 = 120909^2 + 102404^2 .

It is a cyclic number.

It is not a de Polignac number, because 25105565497 - 2²⁷ = 24971347769 is a prime.

It is a super-3 number, since 3×25105565497³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25105565497.

It is not a weakly prime, because it can be changed into another prime (25105565491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12552782748 + 12552782749.

It is an arithmetic number, because the mean of its divisors is an integer number (12552782749).

Almost surely, 2^25105565497 is an apocalyptic number.

It is an amenable number.

25105565497 is a deficient number, since it is larger than the sum of its proper divisors (1).

25105565497 is an equidigital number, since it uses as much as digits as its factorization.

25105565497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890000, while the sum is 49.

The spelling of 25105565497 in words is "twenty-five billion, one hundred five million, five hundred sixty-five thousand, four hundred ninety-seven".