641305544405 has 8 divisors (see below), whose sum is σ = 777500330712. Its totient is φ = 507755317248.

The previous prime is 641305544357. The next prime is 641305544413. The reversal of 641305544405 is 504445503146.

It can be written as a sum of positive squares in 4 ways, for example, as 90263592721 + 551041951684 = 300439^2 + 742322^2 .

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 641305544405 - 2²² = 641301350101 is a prime.

It is a super-2 number, since 2×641305544405² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661139252 + ... + 661140221.

It is an arithmetic number, because the mean of its divisors is an integer number (97187541339).

Almost surely, 2^641305544405 is an apocalyptic number.

It is an amenable number.

641305544405 is a deficient number, since it is larger than the sum of its proper divisors (136194786307).

641305544405 is a wasteful number, since it uses less digits than its factorization.

641305544405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322279575.

The product of its (nonzero) digits is 576000, while the sum is 41.

The spelling of 641305544405 in words is "six hundred forty-one billion, three hundred five million, five hundred forty-four thousand, four hundred five".