644213303206 has 24 divisors (see below), whose sum is σ = 1062501556032. Its totient is φ = 292728229200.

The previous prime is 644213303197. The next prime is 644213303249. The reversal of 644213303206 is 602303312446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 305931 + ... + 1175593.

It is an arithmetic number, because the mean of its divisors is an integer number (44270898168).

Almost surely, 2^644213303206 is an apocalyptic number.

644213303206 is a deficient number, since it is larger than the sum of its proper divisors (418288252826).

644213303206 is a wasteful number, since it uses less digits than its factorization.

644213303206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872748 (or 872737 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 34.

The spelling of 644213303206 in words is "six hundred forty-four billion, two hundred thirteen million, three hundred three thousand, two hundred six".