25499650171 has 2 divisors, whose sum is σ = 25499650172. Its totient is φ = 25499650170.

The previous prime is 25499650159. The next prime is 25499650181. The reversal of 25499650171 is 17105699452.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25499650171 - 2¹⁷ = 25499519099 is a prime.

It is not a weakly prime, because it can be changed into another prime (25499650181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12749825085 + 12749825086.

It is an arithmetic number, because the mean of its divisors is an integer number (12749825086).

Almost surely, 2^25499650171 is an apocalyptic number.

25499650171 is a deficient number, since it is larger than the sum of its proper divisors (1).

25499650171 is an equidigital number, since it uses as much as digits as its factorization.

25499650171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 49.

The spelling of 25499650171 in words is "twenty-five billion, four hundred ninety-nine million, six hundred fifty thousand, one hundred seventy-one".