643523019864 has 64 divisors (see below), whose sum is σ = 1633011840000. Its totient is φ = 211281189504.

The previous prime is 643523019787. The next prime is 643523019871. The reversal of 643523019864 is 468910325346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17858137 + ... + 17894135.

It is an arithmetic number, because the mean of its divisors is an integer number (25515810000).

Almost surely, 2^643523019864 is an apocalyptic number.

It is an amenable number.

643523019864 is an abundant number, since it is smaller than the sum of its proper divisors (989488820136).

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

643523019864 is a wasteful number, since it uses less digits than its factorization.

643523019864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47192 (or 47188 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 51.

The spelling of 643523019864 in words is "six hundred forty-three billion, five hundred twenty-three million, nineteen thousand, eight hundred sixty-four".