643321688132 has 24 divisors (see below), whose sum is σ = 1141512812160. Its totient is φ = 317185521120.

The previous prime is 643321688099. The next prime is 643321688153. The reversal of 643321688132 is 231886123346.

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, 1044719 + ... + 1542102.

It is an arithmetic number, because the mean of its divisors is an integer number (47563033840).

Almost surely, 2^643321688132 is an apocalyptic number.

It is an amenable number.

643321688132 is a deficient number, since it is larger than the sum of its proper divisors (498191124028).

643321688132 is a wasteful number, since it uses less digits than its factorization.

643321688132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587691 (or 2587689 counting only the distinct ones).

The product of its digits is 995328, while the sum is 47.

The spelling of 643321688132 in words is "six hundred forty-three billion, three hundred twenty-one million, six hundred eighty-eight thousand, one hundred thirty-two".