25311799109 has 2 divisors, whose sum is σ = 25311799110. Its totient is φ = 25311799108.

The previous prime is 25311799087. The next prime is 25311799129. The reversal of 25311799109 is 90199711352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25002566884 + 309232225 = 158122^2 + 17585^2 .

It is a cyclic number.

It is not a de Polignac number, because 25311799109 - 2¹² = 25311795013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25311799129) 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, 12655899554 + 12655899555.

It is an arithmetic number, because the mean of its divisors is an integer number (12655899555).

Almost surely, 2^25311799109 is an apocalyptic number.

It is an amenable number.

25311799109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25311799109 is an equidigital number, since it uses as much as digits as its factorization.

25311799109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 153090, while the sum is 47.

The spelling of 25311799109 in words is "twenty-five billion, three hundred eleven million, seven hundred ninety-nine thousand, one hundred nine".