641311530505 has 16 divisors (see below), whose sum is σ = 773785255824. Its totient is φ = 510249093120.

The previous prime is 641311530499. The next prime is 641311530523. The reversal of 641311530505 is 505035113146.

It can be written as a sum of positive squares in 8 ways, for example, as 333478530576 + 307832999929 = 577476^2 + 554827^2 .

It is not a de Polignac number, because 641311530505 - 2⁵ = 641311530473 is a prime.

It is a super-2 number, since 2×641311530505² (a number of 24 digits) contains 22 as substring.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 219085 + ... + 1153525.

It is an arithmetic number, because the mean of its divisors is an integer number (48361578489).

Almost surely, 2^641311530505 is an apocalyptic number.

It is an amenable number.

641311530505 is a deficient number, since it is larger than the sum of its proper divisors (132473725319).

641311530505 is a wasteful number, since it uses less digits than its factorization.

641311530505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935196.

The product of its (nonzero) digits is 27000, while the sum is 34.

The spelling of 641311530505 in words is "six hundred forty-one billion, three hundred eleven million, five hundred thirty thousand, five hundred five".