25990126369 has 2 divisors, whose sum is σ = 25990126370. Its totient is φ = 25990126368.

The previous prime is 25990126321. The next prime is 25990126373. The reversal of 25990126369 is 96362109952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25446630400 + 543495969 = 159520^2 + 23313^2 .

It is a cyclic number.

It is not a de Polignac number, because 25990126369 - 2⁷ = 25990126241 is a prime.

It is a super-2 number, since 2×25990126369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25990126319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12995063184 + 12995063185.

It is an arithmetic number, because the mean of its divisors is an integer number (12995063185).

Almost surely, 2^25990126369 is an apocalyptic number.

It is an amenable number.

25990126369 is a deficient number, since it is larger than the sum of its proper divisors (1).

25990126369 is an equidigital number, since it uses as much as digits as its factorization.

25990126369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The spelling of 25990126369 in words is "twenty-five billion, nine hundred ninety million, one hundred twenty-six thousand, three hundred sixty-nine".