643489187016 has 64 divisors (see below), whose sum is σ = 1732558201920. Its totient is φ = 197986694400.

The previous prime is 643489186981. The next prime is 643489187021. The reversal of 643489187016 is 610781984346.

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 15 ways as a sum of consecutive naturals, for example, 8292091 + ... + 8369333.

It is an arithmetic number, because the mean of its divisors is an integer number (27071221905).

Almost surely, 2^643489187016 is an apocalyptic number.

It is an amenable number.

643489187016 is an abundant number, since it is smaller than the sum of its proper divisors (1089069014904).

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

643489187016 is a wasteful number, since it uses less digits than its factorization.

643489187016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103966 (or 103962 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 57.

The spelling of 643489187016 in words is "six hundred forty-three billion, four hundred eighty-nine million, one hundred eighty-seven thousand, sixteen".