6660840072 has 16 divisors (see below), whose sum is σ = 16652100240. Its totient is φ = 2220280016.

The previous prime is 6660840061. The next prime is 6660840077. The reversal of 6660840072 is 2700480666.

It is a self number, because there is not a number n which added to its sum of digits gives 6660840072.

It is not an unprimeable number, because it can be changed into a prime (6660840077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138767478 + ... + 138767525.

It is an arithmetic number, because the mean of its divisors is an integer number (1040756265).

Almost surely, 2^6660840072 is an apocalyptic number.

It is an amenable number.

6660840072 is an abundant number, since it is smaller than the sum of its proper divisors (9991260168).

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

6660840072 is a wasteful number, since it uses less digits than its factorization.

6660840072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277535012 (or 277535008 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 6660840072 is about 81613.9698336014. The cubic root of 6660840072 is about 1881.5235943966.

The spelling of 6660840072 in words is "six billion, six hundred sixty million, eight hundred forty thousand, seventy-two".