6641568581620 has 48 divisors (see below), whose sum is σ = 15939966486528. Its totient is φ = 2277080386560.

The previous prime is 6641568581611. The next prime is 6641568581623. The reversal of 6641568581620 is 261858651466.

It is a super-2 number, since 2×6641568581620² (a number of 26 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641568581623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12836740 + ... + 13344100.

It is an arithmetic number, because the mean of its divisors is an integer number (332082635136).

Almost surely, 2^{6641568581620} is an apocalyptic number.

It is an amenable number.

6641568581620 is an abundant number, since it is smaller than the sum of its proper divisors (9298397904908).

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

6641568581620 is a wasteful number, since it uses less digits than its factorization.

6641568581620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600880 (or 600878 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 58.

The spelling of 6641568581620 in words is "six trillion, six hundred forty-one billion, five hundred sixty-eight million, five hundred eighty-one thousand, six hundred twenty".