643245621116 has 24 divisors (see below), whose sum is σ = 1287465193056. Its totient is φ = 275467991040.

The previous prime is 643245621107. The next prime is 643245621143. The reversal of 643245621116 is 611126542346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8658341 + ... + 8732316.

It is an arithmetic number, because the mean of its divisors is an integer number (53644383044).

Almost surely, 2^643245621116 is an apocalyptic number.

It is an amenable number.

643245621116 is an abundant number, since it is smaller than the sum of its proper divisors (644219571940).

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

643245621116 is a wasteful number, since it uses less digits than its factorization.

643245621116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17391989 (or 17391987 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The spelling of 643245621116 in words is "six hundred forty-three billion, two hundred forty-five million, six hundred twenty-one thousand, one hundred sixteen".