25218681253 has 2 divisors, whose sum is σ = 25218681254. Its totient is φ = 25218681252.

The previous prime is 25218681233. The next prime is 25218681281. The reversal of 25218681253 is 35218681252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22924079649 + 2294601604 = 151407^2 + 47902^2 .

It is a cyclic number.

It is not a de Polignac number, because 25218681253 - 2¹³ = 25218673061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25218681233) 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, 12609340626 + 12609340627.

It is an arithmetic number, because the mean of its divisors is an integer number (12609340627).

Almost surely, 2^25218681253 is an apocalyptic number.

It is an amenable number.

25218681253 is a deficient number, since it is larger than the sum of its proper divisors (1).

25218681253 is an equidigital number, since it uses as much as digits as its factorization.

25218681253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230400, while the sum is 43.

Subtracting 25218681253 from its reverse (35218681252), we obtain a palindrome (9999999999).

The spelling of 25218681253 in words is "twenty-five billion, two hundred eighteen million, six hundred eighty-one thousand, two hundred fifty-three".