6551720171 has 2 divisors, whose sum is σ = 6551720172. Its totient is φ = 6551720170.

The previous prime is 6551720167. The next prime is 6551720191. The reversal of 6551720171 is 1710271556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6551720171 - 2² = 6551720167 is a prime.

It is not a weakly prime, because it can be changed into another prime (6551720101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3275860085 + 3275860086.

It is an arithmetic number, because the mean of its divisors is an integer number (3275860086).

Almost surely, 2^6551720171 is an apocalyptic number.

6551720171 is a deficient number, since it is larger than the sum of its proper divisors (1).

6551720171 is an equidigital number, since it uses as much as digits as its factorization.

6551720171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14700, while the sum is 35.

The square root of 6551720171 is about 80942.6968354774. The cubic root of 6551720171 is about 1871.1924078281.

The spelling of 6551720171 in words is "six billion, five hundred fifty-one million, seven hundred twenty thousand, one hundred seventy-one".