643203263556120 has 128 divisors (see below), whose sum is σ = 1968804685391040. Its totient is φ = 168071894630400.

The previous prime is 643203263556103. The next prime is 643203263556167. The reversal of 643203263556120 is 21655362302346.

It is a self number, because there is not a number n which added to its sum of digits gives 643203263556120.

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, 272378877 + ... + 274730156.

Almost surely, 2^{643203263556120} is an apocalyptic number.

643203263556120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643203263556120 is an abundant number, since it is smaller than the sum of its proper divisors (1325601421834920).

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

643203263556120 is a wasteful number, since it uses less digits than its factorization.

643203263556120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547109245 (or 547109241 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 48.

The spelling of 643203263556120 in words is "six hundred forty-three trillion, two hundred three billion, two hundred sixty-three million, five hundred fifty-six thousand, one hundred twenty".