643062600646 has 16 divisors (see below), whose sum is σ = 1017303451200. Its totient is φ = 304026165288.

The previous prime is 643062600623. The next prime is 643062600647. The reversal of 643062600646 is 646006260346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643062600647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16158616 + ... + 16198363.

It is an arithmetic number, because the mean of its divisors is an integer number (63581465700).

Almost surely, 2^643062600646 is an apocalyptic number.

643062600646 is a deficient number, since it is larger than the sum of its proper divisors (374240850554).

643062600646 is a wasteful number, since it uses less digits than its factorization.

643062600646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32357523.

The product of its (nonzero) digits is 746496, while the sum is 43.

The spelling of 643062600646 in words is "six hundred forty-three billion, sixty-two million, six hundred thousand, six hundred forty-six".