644316453127271 has 2 divisors, whose sum is σ = 644316453127272. Its totient is φ = 644316453127270.

The previous prime is 644316453127267. The next prime is 644316453127279. The reversal of 644316453127271 is 172721354613446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 644316453127271 - 2² = 644316453127267 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644316453127279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322158226563635 + 322158226563636.

It is an arithmetic number, because the mean of its divisors is an integer number (322158226563636).

Almost surely, 2^{644316453127271} is an apocalyptic number.

644316453127271 is a deficient number, since it is larger than the sum of its proper divisors (1).

644316453127271 is an equidigital number, since it uses as much as digits as its factorization.

644316453127271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 56.

The spelling of 644316453127271 in words is "six hundred forty-four trillion, three hundred sixteen billion, four hundred fifty-three million, one hundred twenty-seven thousand, two hundred seventy-one".