644302466643 has 32 divisors (see below), whose sum is σ = 957849484032. Its totient is φ = 381961904000.

The previous prime is 644302466611. The next prime is 644302466693. The reversal of 644302466643 is 346664203446.

It is a happy number.

644302466643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 644302466643 - 2⁵ = 644302466611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 644302466592 and 644302466601.

It is not an unprimeable number, because it can be changed into a prime (644302466693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 887880 + ... + 1441157.

It is an arithmetic number, because the mean of its divisors is an integer number (29932796376).

Almost surely, 2^644302466643 is an apocalyptic number.

644302466643 is a deficient number, since it is larger than the sum of its proper divisors (313547017389).

644302466643 is a wasteful number, since it uses less digits than its factorization.

644302466643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329235.

The product of its (nonzero) digits is 5971968, while the sum is 48.

The spelling of 644302466643 in words is "six hundred forty-four billion, three hundred two million, four hundred sixty-six thousand, six hundred forty-three".