643975433472 has 72 divisors (see below), whose sum is σ = 1958758626496. Its totient is φ = 183992979456.

The previous prime is 643975433443. The next prime is 643975433477. The reversal of 643975433472 is 274334579346.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643975433477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59888173 + ... + 59898924.

Almost surely, 2^643975433472 is an apocalyptic number.

It is an amenable number.

643975433472 is an abundant number, since it is smaller than the sum of its proper divisors (1314783193024).

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

643975433472 is a wasteful number, since it uses less digits than its factorization.

643975433472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119787123 (or 119787109 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 57.

The spelling of 643975433472 in words is "six hundred forty-three billion, nine hundred seventy-five million, four hundred thirty-three thousand, four hundred seventy-two".