643243651300 has 36 divisors (see below), whose sum is σ = 1413507585280. Its totient is φ = 254040527520.

The previous prime is 643243651249. The next prime is 643243651307. The reversal of 643243651300 is 3156342346.

It is a self number, because there is not a number n which added to its sum of digits gives 643243651300.

It is not an unprimeable number, because it can be changed into a prime (643243651307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40703724 + ... + 40719523.

Almost surely, 2^643243651300 is an apocalyptic number.

It is an amenable number.

643243651300 is an abundant number, since it is smaller than the sum of its proper divisors (770263933980).

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

643243651300 is a wasteful number, since it uses less digits than its factorization.

643243651300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81423340 (or 81423333 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 37.

Adding to 643243651300 its reverse (3156342346), we get a palindrome (646399993646).

The spelling of 643243651300 in words is "six hundred forty-three billion, two hundred forty-three million, six hundred fifty-one thousand, three hundred".