25476665509 has 2 divisors, whose sum is σ = 25476665510. Its totient is φ = 25476665508.

The previous prime is 25476665497. The next prime is 25476665531. The reversal of 25476665509 is 90556667452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19581804225 + 5894861284 = 139935^2 + 76778^2 .

It is a cyclic number.

It is not a de Polignac number, because 25476665509 - 2¹¹ = 25476663461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25476665509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25476665549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12738332754 + 12738332755.

It is an arithmetic number, because the mean of its divisors is an integer number (12738332755).

Almost surely, 2^25476665509 is an apocalyptic number.

It is an amenable number.

25476665509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25476665509 is an equidigital number, since it uses as much as digits as its factorization.

25476665509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608000, while the sum is 55.

The spelling of 25476665509 in words is "twenty-five billion, four hundred seventy-six million, six hundred sixty-five thousand, five hundred nine".