641664710441 has 4 divisors (see below), whose sum is σ = 641666386884. Its totient is φ = 641663034000.

The previous prime is 641664710429. The next prime is 641664710497. The reversal of 641664710441 is 144017466146.

641664710441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 516631750441 + 125032960000 = 718771^2 + 353600^2 .

It is a cyclic number.

It is not a de Polignac number, because 641664710441 - 2⁶ = 641664710377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641664710392 and 641664710401.

It is not an unprimeable number, because it can be changed into a prime (641664710641) 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, 48791 + ... + 1133891.

It is an arithmetic number, because the mean of its divisors is an integer number (160416596721).

Almost surely, 2^641664710441 is an apocalyptic number.

It is an amenable number.

641664710441 is a deficient number, since it is larger than the sum of its proper divisors (1676443).

641664710441 is a wasteful number, since it uses less digits than its factorization.

641664710441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676442.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 641664710441 in words is "six hundred forty-one billion, six hundred sixty-four million, seven hundred ten thousand, four hundred forty-one".