643396171 has 8 divisors (see below), whose sum is σ = 704176704. Its totient is φ = 582997320.

The previous prime is 643396157. The next prime is 643396177. The reversal of 643396171 is 171693346.

643396171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643396171 - 2⁵ = 643396139 is a prime.

It is a super-2 number, since 2×643396171² = 827917265714922482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643396177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91885 + ... + 98638.

It is an arithmetic number, because the mean of its divisors is an integer number (88022088).

Almost surely, 2^643396171 is an apocalyptic number.

643396171 is a deficient number, since it is larger than the sum of its proper divisors (60780533).

643396171 is a wasteful number, since it uses less digits than its factorization.

643396171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190841.

The product of its digits is 81648, while the sum is 40.

The square root of 643396171 is about 25365.2551928815. The cubic root of 643396171 is about 863.2955269177.

The spelling of 643396171 in words is "six hundred forty-three million, three hundred ninety-six thousand, one hundred seventy-one".