6681605140 has 24 divisors (see below), whose sum is σ = 16035852672. Its totient is φ = 2290836000.

The previous prime is 6681605093. The next prime is 6681605141. The reversal of 6681605140 is 415061866.

It is a self number, because there is not a number n which added to its sum of digits gives 6681605140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681605141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23862736 + ... + 23863015.

It is an arithmetic number, because the mean of its divisors is an integer number (668160528).

Almost surely, 2^6681605140 is an apocalyptic number.

It is an amenable number.

6681605140 is an abundant number, since it is smaller than the sum of its proper divisors (9354247532).

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

6681605140 is a wasteful number, since it uses less digits than its factorization.

6681605140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47725767 (or 47725765 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 6681605140 is about 81741.0859971899. The cubic root of 6681605140 is about 1883.4767732310.

The spelling of 6681605140 in words is "six billion, six hundred eighty-one million, six hundred five thousand, one hundred forty".