641205646516 has 12 divisors (see below), whose sum is σ = 1122307858980. Its totient is φ = 320546258240.

The previous prime is 641205646391. The next prime is 641205646531. The reversal of 641205646516 is 615646502146.

641205646516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 334072440100 + 307133206416 = 577990^2 + 554196^2 .

It is a super-2 number, since 2×641205646516² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14115745 + ... + 14161096.

It is an arithmetic number, because the mean of its divisors is an integer number (93525654915).

Almost surely, 2^641205646516 is an apocalyptic number.

It is an amenable number.

641205646516 is a deficient number, since it is larger than the sum of its proper divisors (481102212464).

641205646516 is a wasteful number, since it uses less digits than its factorization.

641205646516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28282514 (or 28282512 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 641205646516 in words is "six hundred forty-one billion, two hundred five million, six hundred forty-six thousand, five hundred sixteen".