25261525493 has 2 divisors, whose sum is σ = 25261525494. Its totient is φ = 25261525492.

The previous prime is 25261525481. The next prime is 25261525537. The reversal of 25261525493 is 39452516252.

It is a happy number.

It is an a-pointer prime, because the next prime (25261525537) can be obtained adding 25261525493 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20540049124 + 4721476369 = 143318^2 + 68713^2 .

It is a cyclic number.

It is not a de Polignac number, because 25261525493 - 2¹⁰ = 25261524469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25261525403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12630762746 + 12630762747.

It is an arithmetic number, because the mean of its divisors is an integer number (12630762747).

Almost surely, 2^25261525493 is an apocalyptic number.

It is an amenable number.

25261525493 is a deficient number, since it is larger than the sum of its proper divisors (1).

25261525493 is an equidigital number, since it uses as much as digits as its factorization.

25261525493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 44.

The spelling of 25261525493 in words is "twenty-five billion, two hundred sixty-one million, five hundred twenty-five thousand, four hundred ninety-three".