644304341043 has 24 divisors (see below), whose sum is σ = 1042707113136. Its totient is φ = 379933761600.

The previous prime is 644304341041. The next prime is 644304341071. The reversal of 644304341043 is 340143403446.

644304341043 is a `hidden beast` number, since 6 + 4 + 4 + 304 + 341 + 0 + 4 + 3 = 666.

It is not a de Polignac number, because 644304341043 - 2¹ = 644304341041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 644304340989 and 644304341007.

It is not an unprimeable number, because it can be changed into a prime (644304341041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87943968 + ... + 87951293.

It is an arithmetic number, because the mean of its divisors is an integer number (43446129714).

Almost surely, 2^644304341043 is an apocalyptic number.

644304341043 is a deficient number, since it is larger than the sum of its proper divisors (398402772093).

644304341043 is a wasteful number, since it uses less digits than its factorization.

644304341043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175895315 (or 175895312 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 36.

Adding to 644304341043 its reverse (340143403446), we get a palindrome (984447744489).

The spelling of 644304341043 in words is "six hundred forty-four billion, three hundred four million, three hundred forty-one thousand, forty-three".