25655640137 has 2 divisors, whose sum is σ = 25655640138. Its totient is φ = 25655640136.

The previous prime is 25655640113. The next prime is 25655640193. The reversal of 25655640137 is 73104655652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25568329801 + 87310336 = 159901^2 + 9344^2 .

It is a cyclic number.

It is not a de Polignac number, because 25655640137 - 2¹⁶ = 25655574601 is a prime.

It is not a weakly prime, because it can be changed into another prime (25655600137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12827820068 + 12827820069.

It is an arithmetic number, because the mean of its divisors is an integer number (12827820069).

Almost surely, 2^25655640137 is an apocalyptic number.

It is an amenable number.

25655640137 is a deficient number, since it is larger than the sum of its proper divisors (1).

25655640137 is an equidigital number, since it uses as much as digits as its factorization.

25655640137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756000, while the sum is 44.

The spelling of 25655640137 in words is "twenty-five billion, six hundred fifty-five million, six hundred forty thousand, one hundred thirty-seven".