64720171 has 2 divisors, whose sum is σ = 64720172. Its totient is φ = 64720170.

The previous prime is 64720151. The next prime is 64720211. The reversal of 64720171 is 17102746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64720171 - 2⁷ = 64720043 is a prime.

It is not a weakly prime, because it can be changed into another prime (64720111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32360085 + 32360086.

It is an arithmetic number, because the mean of its divisors is an integer number (32360086).

Almost surely, 2^64720171 is an apocalyptic number.

64720171 is a deficient number, since it is larger than the sum of its proper divisors (1).

64720171 is an equidigital number, since it uses as much as digits as its factorization.

64720171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 64720171 is about 8044.8847723258. The cubic root of 64720171 is about 401.4947634973.

The spelling of 64720171 in words is "sixty-four million, seven hundred twenty thousand, one hundred seventy-one".