645116171 has 4 divisors (see below), whose sum is σ = 737275632. Its totient is φ = 552956712.

The previous prime is 645116141. The next prime is 645116237. The reversal of 645116171 is 171611546.

645116171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 645116171 - 2¹⁰ = 645115147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645116141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46079720 + ... + 46079733.

It is an arithmetic number, because the mean of its divisors is an integer number (184318908).

Almost surely, 2^645116171 is an apocalyptic number.

645116171 is a deficient number, since it is larger than the sum of its proper divisors (92159461).

645116171 is an equidigital number, since it uses as much as digits as its factorization.

645116171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92159460.

The product of its digits is 5040, while the sum is 32.

The square root of 645116171 is about 25399.1372097558. The cubic root of 645116171 is about 864.0641290956.

It can be divided in two parts, 6451 and 16171, that added together give a palindrome (22622).

The spelling of 645116171 in words is "six hundred forty-five million, one hundred sixteen thousand, one hundred seventy-one".