643053560688 has 400 divisors, whose sum is σ = 2395300976640. Its totient is φ = 161638156800.

The previous prime is 643053560683. The next prime is 643053560729. The reversal of 643053560688 is 886065350346.

It is a happy number.

643053560688 is a `hidden beast` number, since 6 + 43 + 0 + 535 + 6 + 0 + 68 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643053560683) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2989618 + ... + 3197486.

Almost surely, 2^643053560688 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 643053560688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1197650488320).

643053560688 is an abundant number, since it is smaller than the sum of its proper divisors (1752247415952).

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

643053560688 is a wasteful number, since it uses less digits than its factorization.

643053560688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207938 (or 207923 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 54.

The spelling of 643053560688 in words is "six hundred forty-three billion, fifty-three million, five hundred sixty thousand, six hundred eighty-eight".