643310020244 has 24 divisors (see below), whose sum is σ = 1126816994688. Its totient is φ = 321362399520.

The previous prime is 643310020229. The next prime is 643310020253. The reversal of 643310020244 is 442020013346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55803209 + ... + 55814735.

It is an arithmetic number, because the mean of its divisors is an integer number (46950708112).

Almost surely, 2^643310020244 is an apocalyptic number.

It is an amenable number.

643310020244 is a deficient number, since it is larger than the sum of its proper divisors (483506974444).

643310020244 is a wasteful number, since it uses less digits than its factorization.

643310020244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23015 (or 23013 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The spelling of 643310020244 in words is "six hundred forty-three billion, three hundred ten million, twenty thousand, two hundred forty-four".