6661560660992 has 88 divisors (see below), whose sum is σ = 13395103904160. Its totient is φ = 3311176458240.

The previous prime is 6661560660959. The next prime is 6661560661001. The reversal of 6661560660992 is 2990660651666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260418059 + ... + 260443637.

It is an arithmetic number, because the mean of its divisors is an integer number (152217089820).

Almost surely, 2^{6661560660992} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6661560660992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6697551952080).

6661560660992 is an abundant number, since it is smaller than the sum of its proper divisors (6733543243168).

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

6661560660992 is a wasteful number, since it uses less digits than its factorization.

6661560660992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27087 (or 27069 counting only the distinct ones).

The product of its (nonzero) digits is 37791360, while the sum is 62.

The spelling of 6661560660992 in words is "six trillion, six hundred sixty-one billion, five hundred sixty million, six hundred sixty thousand, nine hundred ninety-two".