66600110640000 has 1280 divisors, whose sum is σ = 255763505479680. Its totient is φ = 15036005376000.

The previous prime is 66600110639989. The next prime is 66600110640029. The reversal of 66600110640000 is 4601100666.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 66600110640000.

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, 60380879449 + ... + 60380880551.

It is an arithmetic number, because the mean of its divisors is an integer number (199815238656).

Almost surely, 2^{66600110640000} is an apocalyptic number.

66600110640000 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 66600110640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127881752739840).

66600110640000 is an abundant number, since it is smaller than the sum of its proper divisors (189163394839680).

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

66600110640000 is a wasteful number, since it uses less digits than its factorization.

66600110640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1530 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

Adding to 66600110640000 its reverse (4601100666), we get a palindrome (66604711740666).

The spelling of 66600110640000 in words is "sixty-six trillion, six hundred billion, one hundred ten million, six hundred forty thousand".