642443444443 has 8 divisors (see below), whose sum is σ = 645023001456. Its totient is φ = 639865968000.

The previous prime is 642443444441. The next prime is 642443444477. The reversal of 642443444443 is 344444344246.

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 642443444443 - 2¹ = 642443444441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642443444393 and 642443444402.

It is not an unprimeable number, because it can be changed into a prime (642443444441) 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, 100143 + ... + 1137943.

It is an arithmetic number, because the mean of its divisors is an integer number (80627875182).

Almost surely, 2^642443444443 is an apocalyptic number.

642443444443 is a deficient number, since it is larger than the sum of its proper divisors (2579557013).

642443444443 is a wasteful number, since it uses less digits than its factorization.

642443444443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040285.

The product of its digits is 7077888, while the sum is 46.

Adding to 642443444443 its reverse (344444344246), we get a palindrome (986887788689).

The spelling of 642443444443 in words is "six hundred forty-two billion, four hundred forty-three million, four hundred forty-four thousand, four hundred forty-three".