643556606502 has 16 divisors (see below), whose sum is σ = 1290759430320. Its totient is φ = 213911165952.

The previous prime is 643556606501. The next prime is 643556606513. The reversal of 643556606502 is 205606655346.

643556606502 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×643556606502³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643556606501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151923427 + ... + 151927662.

It is an arithmetic number, because the mean of its divisors is an integer number (80672464395).

Almost surely, 2^643556606502 is an apocalyptic number.

643556606502 is an abundant number, since it is smaller than the sum of its proper divisors (647202823818).

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

643556606502 is a wasteful number, since it uses less digits than its factorization.

643556606502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303851447.

The product of its (nonzero) digits is 3888000, while the sum is 48.

The spelling of 643556606502 in words is "six hundred forty-three billion, five hundred fifty-six million, six hundred six thousand, five hundred two".