643066700552 has 64 divisors (see below), whose sum is σ = 1287476346240. Its totient is φ = 300657139200.

The previous prime is 643066700539. The next prime is 643066700567. The reversal of 643066700552 is 255007660346.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417677 + ... + 1208547.

It is an arithmetic number, because the mean of its divisors is an integer number (20116817910).

Almost surely, 2^643066700552 is an apocalyptic number.

It is an amenable number.

643066700552 is an abundant number, since it is smaller than the sum of its proper divisors (644409645688).

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

643066700552 is a wasteful number, since it uses less digits than its factorization.

643066700552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791022 (or 791018 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 643066700552 in words is "six hundred forty-three billion, sixty-six million, seven hundred thousand, five hundred fifty-two".