643345610544 has 180 divisors, whose sum is σ = 2255539396656. Its totient is φ = 169673543424.

The previous prime is 643345610543. The next prime is 643345610549. The reversal of 643345610544 is 445016543346.

643345610544 is a `hidden beast` number, since 6 + 4 + 3 + 3 + 45 + 61 + 0 + 544 = 666.

643345610544 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 643345610544.

It is not an unprimeable number, because it can be changed into a prime (643345610543) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3415084 + ... + 3598539.

Almost surely, 2^643345610544 is an apocalyptic number.

It is an amenable number.

643345610544 is an abundant number, since it is smaller than the sum of its proper divisors (1612193786112).

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

643345610544 is a wasteful number, since it uses less digits than its factorization.

643345610544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013664 (or 7013648 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 45.

The spelling of 643345610544 in words is "six hundred forty-three billion, three hundred forty-five million, six hundred ten thousand, five hundred forty-four".