25655706121 has 2 divisors, whose sum is σ = 25655706122. Its totient is φ = 25655706120.

The previous prime is 25655706101. The next prime is 25655706149. The reversal of 25655706121 is 12160755652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13253765625 + 12401940496 = 115125^2 + 111364^2 .

It is a cyclic number.

It is not a de Polignac number, because 25655706121 - 2⁹ = 25655705609 is a prime.

It is not a weakly prime, because it can be changed into another prime (25655706101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12827853060 + 12827853061.

It is an arithmetic number, because the mean of its divisors is an integer number (12827853061).

Almost surely, 2^25655706121 is an apocalyptic number.

It is an amenable number.

25655706121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25655706121 is an equidigital number, since it uses as much as digits as its factorization.

25655706121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 40.

The spelling of 25655706121 in words is "twenty-five billion, six hundred fifty-five million, seven hundred six thousand, one hundred twenty-one".