27565725137 has 2 divisors, whose sum is σ = 27565725138. Its totient is φ = 27565725136.

The previous prime is 27565725127. The next prime is 27565725139. The reversal of 27565725137 is 73152756572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26844856336 + 720868801 = 163844^2 + 26849^2 .

It is a cyclic number.

It is not a de Polignac number, because 27565725137 - 2⁶ = 27565725073 is a prime.

Together with 27565725139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27565725139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13782862568 + 13782862569.

It is an arithmetic number, because the mean of its divisors is an integer number (13782862569).

Almost surely, 2^27565725137 is an apocalyptic number.

It is an amenable number.

27565725137 is a deficient number, since it is larger than the sum of its proper divisors (1).

27565725137 is an equidigital number, since it uses as much as digits as its factorization.

27565725137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3087000, while the sum is 50.

The spelling of 27565725137 in words is "twenty-seven billion, five hundred sixty-five million, seven hundred twenty-five thousand, one hundred thirty-seven".