641644446103 has 4 divisors (see below), whose sum is σ = 642592222920. Its totient is φ = 640696669288.

The previous prime is 641644446101. The next prime is 641644446139. The reversal of 641644446103 is 301644446146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641644446103 - 2¹ = 641644446101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641644446103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641644446101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473887393 + ... + 473888746.

It is an arithmetic number, because the mean of its divisors is an integer number (160648055730).

Almost surely, 2^641644446103 is an apocalyptic number.

641644446103 is a deficient number, since it is larger than the sum of its proper divisors (947776817).

641644446103 is an equidigital number, since it uses as much as digits as its factorization.

641644446103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947776816.

The product of its (nonzero) digits is 663552, while the sum is 43.

Adding to 641644446103 its sum of digits (43), we get a palindrome (641644446146).

The spelling of 641644446103 in words is "six hundred forty-one billion, six hundred forty-four million, four hundred forty-six thousand, one hundred three".