6660615720672 has 60 divisors (see below), whose sum is σ = 19588685825016. Its totient is φ = 2220205239360.

The previous prime is 6660615720667. The next prime is 6660615720709. The reversal of 6660615720672 is 2760275160666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1284838404 + ... + 1284843587.

Almost surely, 2^{6660615720672} is an apocalyptic number.

It is an amenable number.

6660615720672 is an abundant number, since it is smaller than the sum of its proper divisors (12928070104344).

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

6660615720672 is a wasteful number, since it uses less digits than its factorization.

6660615720672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569682013 (or 2569681996 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

The spelling of 6660615720672 in words is "six trillion, six hundred sixty billion, six hundred fifteen million, seven hundred twenty thousand, six hundred seventy-two".