25123121269 has 2 divisors, whose sum is σ = 25123121270. Its totient is φ = 25123121268.

The previous prime is 25123121207. The next prime is 25123121281. The reversal of 25123121269 is 96212132152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19574808100 + 5548313169 = 139910^2 + 74487^2 .

It is a cyclic number.

It is not a de Polignac number, because 25123121269 - 2¹⁷ = 25122990197 is a prime.

It is a super-2 number, since 2×25123121269² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25123121299) 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, 12561560634 + 12561560635.

It is an arithmetic number, because the mean of its divisors is an integer number (12561560635).

Almost surely, 2^25123121269 is an apocalyptic number.

It is an amenable number.

25123121269 is a deficient number, since it is larger than the sum of its proper divisors (1).

25123121269 is an equidigital number, since it uses as much as digits as its factorization.

25123121269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The spelling of 25123121269 in words is "twenty-five billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred sixty-nine".