6641867668 has 12 divisors (see below), whose sum is σ = 11623851540. Its totient is φ = 3320767232.

The previous prime is 6641867641. The next prime is 6641867671. The reversal of 6641867668 is 8667681466.

It can be written as a sum of positive squares in 2 ways, for example, as 1337950084 + 5303917584 = 36578^2 + 72828^2 .

It is a super-2 number, since 2×6641867668² = 88228812238447516448, which 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, 106980 + ... + 157252.

It is an arithmetic number, because the mean of its divisors is an integer number (968654295).

Almost surely, 2^6641867668 is an apocalyptic number.

It is an amenable number.

6641867668 is a deficient number, since it is larger than the sum of its proper divisors (4981983872).

6641867668 is a wasteful number, since it uses less digits than its factorization.

6641867668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83306 (or 83304 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 58.

The square root of 6641867668 is about 81497.6543711535. The cubic root of 6641867668 is about 1879.7354830044.

The spelling of 6641867668 in words is "six billion, six hundred forty-one million, eight hundred sixty-seven thousand, six hundred sixty-eight".