643163042134633 has 8 divisors (see below), whose sum is σ = 665770607541000. Its totient is φ = 620584112026368.

The previous prime is 643163042134631. The next prime is 643163042134661. The reversal of 643163042134633 is 336431240361346.

It can be written as a sum of positive squares in 4 ways, for example, as 87305701437504 + 555857340697129 = 9343752^2 + 23576627^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643163042134633 - 2¹ = 643163042134631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643163042134631) 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, 7158778816 + ... + 7158868657.

It is an arithmetic number, because the mean of its divisors is an integer number (83221325942625).

Almost surely, 2^{643163042134633} is an apocalyptic number.

It is an amenable number.

643163042134633 is a deficient number, since it is larger than the sum of its proper divisors (22607565406367).

643163042134633 is a wasteful number, since it uses less digits than its factorization.

643163042134633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14317649051.

The product of its (nonzero) digits is 6718464, while the sum is 49.

Adding to 643163042134633 its reverse (336431240361346), we get a palindrome (979594282495979).

The spelling of 643163042134633 in words is "six hundred forty-three trillion, one hundred sixty-three billion, forty-two million, one hundred thirty-four thousand, six hundred thirty-three".