25166315077 has 2 divisors, whose sum is σ = 25166315078. Its totient is φ = 25166315076.

The previous prime is 25166315039. The next prime is 25166315087. The reversal of 25166315077 is 77051366152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23570232676 + 1596082401 = 153526^2 + 39951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25166315077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25166315087) 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, 12583157538 + 12583157539.

It is an arithmetic number, because the mean of its divisors is an integer number (12583157539).

Almost surely, 2^25166315077 is an apocalyptic number.

It is an amenable number.

25166315077 is a deficient number, since it is larger than the sum of its proper divisors (1).

25166315077 is an equidigital number, since it uses as much as digits as its factorization.

25166315077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 43.

The spelling of 25166315077 in words is "twenty-five billion, one hundred sixty-six million, three hundred fifteen thousand, seventy-seven".