643495789536 has 48 divisors (see below), whose sum is σ = 1747423918800. Its totient is φ = 207102092288.

The previous prime is 643495789529. The next prime is 643495789553. The reversal of 643495789536 is 635987594346.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

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, 115567581 + ... + 115573148.

It is an arithmetic number, because the mean of its divisors is an integer number (36404664975).

Almost surely, 2^643495789536 is an apocalyptic number.

It is an amenable number.

643495789536 is an abundant number, since it is smaller than the sum of its proper divisors (1103928129264).

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

643495789536 is a wasteful number, since it uses less digits than its factorization.

643495789536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231140771 (or 231140763 counting only the distinct ones).

The product of its digits is 587865600, while the sum is 69.

The spelling of 643495789536 in words is "six hundred forty-three billion, four hundred ninety-five million, seven hundred eighty-nine thousand, five hundred thirty-six".