641644446145 has 16 divisors (see below), whose sum is σ = 804141447552. Its totient is φ = 490575205120.

The previous prime is 641644446143. The next prime is 641644446187. The reversal of 641644446145 is 541644446146.

It is not a de Polignac number, because 641644446145 - 2¹ = 641644446143 is a prime.

It is a super-2 number, since 2×641644446145² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641644446143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2265016 + ... + 2532505.

It is an arithmetic number, because the mean of its divisors is an integer number (50258840472).

Almost surely, 2^641644446145 is an apocalyptic number.

It is an amenable number.

641644446145 is a deficient number, since it is larger than the sum of its proper divisors (162497001407).

641644446145 is a wasteful number, since it uses less digits than its factorization.

641644446145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4798712.

The product of its digits is 4423680, while the sum is 49.

Subtracting from 641644446145 its reverse (541644446146), we obtain a palindrome (99999999999).

The spelling of 641644446145 in words is "six hundred forty-one billion, six hundred forty-four million, four hundred forty-six thousand, one hundred forty-five".