644316453127147 has 4 divisors (see below), whose sum is σ = 644316505385176. Its totient is φ = 644316400869120.

The previous prime is 644316453127133. The next prime is 644316453127163. The reversal of 644316453127147 is 741721354613446.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 644316453127147 - 2⁷ = 644316453127019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 644316453127091 and 644316453127100.

It is not an unprimeable number, because it can be changed into a prime (644316453127117) 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, 3768268 + ... + 36094774.

It is an arithmetic number, because the mean of its divisors is an integer number (161079126346294).

Almost surely, 2^{644316453127147} is an apocalyptic number.

644316453127147 is a deficient number, since it is larger than the sum of its proper divisors (52258029).

644316453127147 is a wasteful number, since it uses less digits than its factorization.

644316453127147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52258028.

The product of its digits is 40642560, while the sum is 58.

The spelling of 644316453127147 in words is "six hundred forty-four trillion, three hundred sixteen billion, four hundred fifty-three million, one hundred twenty-seven thousand, one hundred forty-seven".