6660402178752 has 1344 divisors, whose sum is σ = 25680460216320. Its totient is φ = 1666465726464.

The previous prime is 6660402178723. The next prime is 6660402178757. The reversal of 6660402178752 is 2578712040666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (1344).

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

It is not an unprimeable number, because it can be changed into a prime (6660402178757) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1574933374 + ... + 1574937602.

It is an arithmetic number, because the mean of its divisors is an integer number (19107485280).

Almost surely, 2^{6660402178752} 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 6660402178752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12840230108160).

6660402178752 is an abundant number, since it is smaller than the sum of its proper divisors (19020058037568).

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

6660402178752 is a wasteful number, since it uses less digits than its factorization.

6660402178752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4340 (or 4318 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 6660402178752 in words is "six trillion, six hundred sixty billion, four hundred two million, one hundred seventy-eight thousand, seven hundred fifty-two".