644315453127171 has 72 divisors (see below), whose sum is σ = 1095017400397440. Its totient is φ = 363967657853184.

The previous prime is 644315453127131. The next prime is 644315453127173. The reversal of 644315453127171 is 171721354513446.

644315453127171 is a `hidden beast` number, since 6 + 4 + 4 + 3 + 1 + 5 + 453 + 12 + 7 + 171 = 666.

It is not a de Polignac number, because 644315453127171 - 2¹⁴ = 644315453110787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644315453127173) 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 71 ways as a sum of consecutive naturals, for example, 187200046 + ... + 190610828.

It is an arithmetic number, because the mean of its divisors is an integer number (15208575005520).

Almost surely, 2^{644315453127171} is an apocalyptic number.

644315453127171 is a deficient number, since it is larger than the sum of its proper divisors (450701947270269).

644315453127171 is a wasteful number, since it uses less digits than its factorization.

644315453127171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415705 (or 3415695 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The spelling of 644315453127171 in words is "six hundred forty-four trillion, three hundred fifteen billion, four hundred fifty-three million, one hundred twenty-seven thousand, one hundred seventy-one".