644316453127171 has 8 divisors (see below), whose sum is σ = 719236970933184. Its totient is φ = 572120317786920.

The previous prime is 644316453127163. The next prime is 644316453127183. The reversal of 644316453127171 is 171721354613446.

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 644316453127171 - 2³ = 644316453127163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644316453127271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681095615941 + ... + 681095616886.

It is an arithmetic number, because the mean of its divisors is an integer number (89904621366648).

Almost surely, 2^{644316453127171} is an apocalyptic number.

644316453127171 is a deficient number, since it is larger than the sum of its proper divisors (74920517806013).

644316453127171 is a wasteful number, since it uses less digits than its factorization.

644316453127171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362191232881.

The product of its digits is 10160640, while the sum is 55.

The spelling of 644316453127171 in words is "six hundred forty-four trillion, three hundred sixteen billion, four hundred fifty-three million, one hundred twenty-seven thousand, one hundred seventy-one".