642044546641 has 8 divisors (see below), whose sum is σ = 681267581280. Its totient is φ = 602983257408.

The previous prime is 642044546629. The next prime is 642044546659. The reversal of 642044546641 is 146645440246.

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 642044546641 - 2¹¹ = 642044544593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642044546591 and 642044546600.

It is not an unprimeable number, because it can be changed into a prime (642044541641) 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, 40428171 + ... + 40444048.

It is an arithmetic number, because the mean of its divisors is an integer number (85158447660).

Almost surely, 2^642044546641 is an apocalyptic number.

It is an amenable number.

642044546641 is a deficient number, since it is larger than the sum of its proper divisors (39223034639).

642044546641 is a wasteful number, since it uses less digits than its factorization.

642044546641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80872703.

The product of its (nonzero) digits is 2211840, while the sum is 46.

Adding to 642044546641 its reverse (146645440246), we get a palindrome (788689986887).

The spelling of 642044546641 in words is "six hundred forty-two billion, forty-four million, five hundred forty-six thousand, six hundred forty-one".