643534004452 has 12 divisors (see below), whose sum is σ = 1175149051776. Its totient is φ = 307777132520.

The previous prime is 643534004437. The next prime is 643534004473. The reversal of 643534004452 is 254400435346.

643534004452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3497467324 + ... + 3497467507.

It is an arithmetic number, because the mean of its divisors is an integer number (97929087648).

Almost surely, 2^643534004452 is an apocalyptic number.

It is an amenable number.

643534004452 is a deficient number, since it is larger than the sum of its proper divisors (531615047324).

643534004452 is a wasteful number, since it uses less digits than its factorization.

643534004452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6994934858 (or 6994934856 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 40.

Adding to 643534004452 its reverse (254400435346), we get a palindrome (897934439798).

The spelling of 643534004452 in words is "six hundred forty-three billion, five hundred thirty-four million, four thousand, four hundred fifty-two".