25165522556137 has 2 divisors, whose sum is σ = 25165522556138. Its totient is φ = 25165522556136.

The previous prime is 25165522556077. The next prime is 25165522556177. The reversal of 25165522556137 is 73165522556152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22738248919296 + 2427273636841 = 4768464^2 + 1557971^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25165522556137 is a prime.

It is not a weakly prime, because it can be changed into another prime (25165522556177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12582761278068 + 12582761278069.

It is an arithmetic number, because the mean of its divisors is an integer number (12582761278069).

Almost surely, 2^{25165522556137} is an apocalyptic number.

It is an amenable number.

25165522556137 is a deficient number, since it is larger than the sum of its proper divisors (1).

25165522556137 is an equidigital number, since it uses as much as digits as its factorization.

25165522556137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900000, while the sum is 55.

The spelling of 25165522556137 in words is "twenty-five trillion, one hundred sixty-five billion, five hundred twenty-two million, five hundred fifty-six thousand, one hundred thirty-seven".