25208727161 has 2 divisors, whose sum is σ = 25208727162. Its totient is φ = 25208727160.

The previous prime is 25208727149. The next prime is 25208727197. The reversal of 25208727161 is 16172780252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23003485561 + 2205241600 = 151669^2 + 46960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25208727161 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25208727121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12604363580 + 12604363581.

It is an arithmetic number, because the mean of its divisors is an integer number (12604363581).

Almost surely, 2^25208727161 is an apocalyptic number.

It is an amenable number.

25208727161 is a deficient number, since it is larger than the sum of its proper divisors (1).

25208727161 is an equidigital number, since it uses as much as digits as its factorization.

25208727161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 41.

The spelling of 25208727161 in words is "twenty-five billion, two hundred eight million, seven hundred twenty-seven thousand, one hundred sixty-one".