25165635565087 has 2 divisors, whose sum is σ = 25165635565088. Its totient is φ = 25165635565086.

The previous prime is 25165635565079. The next prime is 25165635565139. The reversal of 25165635565087 is 78056553656152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25165635565087 - 2³ = 25165635565079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25165635565027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12582817782543 + 12582817782544.

It is an arithmetic number, because the mean of its divisors is an integer number (12582817782544).

Almost surely, 2^{25165635565087} is an apocalyptic number.

25165635565087 is a deficient number, since it is larger than the sum of its proper divisors (1).

25165635565087 is an equidigital number, since it uses as much as digits as its factorization.

25165635565087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800000, while the sum is 64.

The spelling of 25165635565087 in words is "twenty-five trillion, one hundred sixty-five billion, six hundred thirty-five million, five hundred sixty-five thousand, eighty-seven".