6661223267328 has 1760 divisors, whose sum is σ = 25022775343104. Its totient is φ = 1722007683072.

The previous prime is 6661223267299. The next prime is 6661223267333. The reversal of 6661223267328 is 8237623221666.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 38504180650 + ... + 38504180822.

Almost surely, 2^{6661223267328} is an apocalyptic number.

6661223267328 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6661223267328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12511387671552).

6661223267328 is an abundant number, since it is smaller than the sum of its proper divisors (18361552075776).

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

6661223267328 is a wasteful number, since it uses less digits than its factorization.

6661223267328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 332 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 54.

The spelling of 6661223267328 in words is "six trillion, six hundred sixty-one billion, two hundred twenty-three million, two hundred sixty-seven thousand, three hundred twenty-eight".