6661228654080 has 3600 divisors, whose sum is σ = 32815863400320. Its totient is φ = 1236462796800.

The previous prime is 6661228654063. The next prime is 6661228654081. The reversal of 6661228654080 is 804568221666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661228654081) by changing a digit.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 214878343665 + ... + 214878343695.

Almost surely, 2^{6661228654080} is an apocalyptic number.

6661228654080 is a gapful number since it is divisible by the number (60) 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 6661228654080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16407931700160).

6661228654080 is an abundant number, since it is smaller than the sum of its proper divisors (26154634746240).

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

6661228654080 is a wasteful number, since it uses less digits than its factorization.

6661228654080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 6661228654080 in words is "six trillion, six hundred sixty-one billion, two hundred twenty-eight million, six hundred fifty-four thousand, eighty".