25810830121 has 2 divisors, whose sum is σ = 25810830122. Its totient is φ = 25810830120.

The previous prime is 25810830119. The next prime is 25810830167. The reversal of 25810830121 is 12103801852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13181565721 + 12629264400 = 114811^2 + 112380^2 .

It is a cyclic number.

It is not a de Polignac number, because 25810830121 - 2¹ = 25810830119 is a prime.

Together with 25810830119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25810831121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12905415060 + 12905415061.

It is an arithmetic number, because the mean of its divisors is an integer number (12905415061).

Almost surely, 2^25810830121 is an apocalyptic number.

It is an amenable number.

25810830121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25810830121 is an equidigital number, since it uses as much as digits as its factorization.

25810830121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 31.

The spelling of 25810830121 in words is "twenty-five billion, eight hundred ten million, eight hundred thirty thousand, one hundred twenty-one".