6660111020720 has 40 divisors (see below), whose sum is σ = 15903265106544. Its totient is φ = 2592043206912.

The previous prime is 6660111020663. The next prime is 6660111020729. The reversal of 6660111020720 is 270201110666.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×6660111020720³ (a number of 39 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6660111020729) 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, 1125015794 + ... + 1125021713.

Almost surely, 2^{6660111020720} is an apocalyptic number.

It is an amenable number.

6660111020720 is an abundant number, since it is smaller than the sum of its proper divisors (9243154085824).

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

6660111020720 is a wasteful number, since it uses less digits than its factorization.

6660111020720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250037557 (or 2250037551 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 6660111020720 in words is "six trillion, six hundred sixty billion, one hundred eleven million, twenty thousand, seven hundred twenty".