25217712493 has 2 divisors, whose sum is σ = 25217712494. Its totient is φ = 25217712492.

The previous prime is 25217712491. The next prime is 25217712547. The reversal of 25217712493 is 39421771252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20249859204 + 4967853289 = 142302^2 + 70483^2 .

It is a cyclic number.

It is not a de Polignac number, because 25217712493 - 2¹ = 25217712491 is a prime.

Together with 25217712491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25217712491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12608856246 + 12608856247.

It is an arithmetic number, because the mean of its divisors is an integer number (12608856247).

Almost surely, 2^25217712493 is an apocalyptic number.

It is an amenable number.

25217712493 is a deficient number, since it is larger than the sum of its proper divisors (1).

25217712493 is an equidigital number, since it uses as much as digits as its factorization.

25217712493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

It can be divided in two parts, 2521771249 and 3, that added together give a palindrome (2521771252).

The spelling of 25217712493 in words is "twenty-five billion, two hundred seventeen million, seven hundred twelve thousand, four hundred ninety-three".