643351334552 has 8 divisors (see below), whose sum is σ = 1206283752300. Its totient is φ = 321675667272.

The previous prime is 643351334543. The next prime is 643351334569. The reversal of 643351334552 is 255433153346.

643351334552 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40209458402 + ... + 40209458417.

Almost surely, 2^643351334552 is an apocalyptic number.

It is an amenable number.

643351334552 is a deficient number, since it is larger than the sum of its proper divisors (562932417748).

643351334552 is a wasteful number, since it uses less digits than its factorization.

643351334552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80418916825 (or 80418916821 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 44.

Adding to 643351334552 its reverse (255433153346), we get a palindrome (898784487898).

The spelling of 643351334552 in words is "six hundred forty-three billion, three hundred fifty-one million, three hundred thirty-four thousand, five hundred fifty-two".