643312252604 has 96 divisors (see below), whose sum is σ = 1385320849920. Its totient is φ = 255118989312.

The previous prime is 643312252591. The next prime is 643312252613. The reversal of 643312252604 is 406252213346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16660232 + ... + 16698800.

It is an arithmetic number, because the mean of its divisors is an integer number (14430425520).

Almost surely, 2^643312252604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643312252604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (692660424960).

643312252604 is an abundant number, since it is smaller than the sum of its proper divisors (742008597316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643312252604 is a wasteful number, since it uses less digits than its factorization.

643312252604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39187 (or 39185 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 38.

The spelling of 643312252604 in words is "six hundred forty-three billion, three hundred twelve million, two hundred fifty-two thousand, six hundred four".