641008660 has 24 divisors (see below), whose sum is σ = 1346594760. Its totient is φ = 256312704.

The previous prime is 641008603. The next prime is 641008673. The reversal of 641008660 is 66800146.

It can be written as a sum of positive squares in 4 ways, for example, as 26563716 + 614444944 = 5154^2 + 24788^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103162 + ... + 109198.

It is an arithmetic number, because the mean of its divisors is an integer number (56108115).

Almost surely, 2^641008660 is an apocalyptic number.

It is an amenable number.

641008660 is an abundant number, since it is smaller than the sum of its proper divisors (705586100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641008660 is a wasteful number, since it uses less digits than its factorization.

641008660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11355 (or 11353 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 641008660 is about 25318.1488264841. The cubic root of 641008660 is about 862.2263659029.

It can be divided in two parts, 6410086 and 60, that added together give a palindrome (6410146).

The spelling of 641008660 in words is "six hundred forty-one million, eight thousand, six hundred sixty".