25678108492109 has 2 divisors, whose sum is σ = 25678108492110. Its totient is φ = 25678108492108.

The previous prime is 25678108492013. The next prime is 25678108492181. The reversal of 25678108492109 is 90129480187652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16094459004100 + 9583649488009 = 4011790^2 + 3095747^2 .

It is a cyclic number.

It is not a de Polignac number, because 25678108492109 - 2²⁰ = 25678107443533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25678108494109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12839054246054 + 12839054246055.

It is an arithmetic number, because the mean of its divisors is an integer number (12839054246055).

Almost surely, 2^{25678108492109} is an apocalyptic number.

It is an amenable number.

25678108492109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25678108492109 is an equidigital number, since it uses as much as digits as its factorization.

25678108492109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 25678108492109 in words is "twenty-five trillion, six hundred seventy-eight billion, one hundred eight million, four hundred ninety-two thousand, one hundred nine".