66745408044780 has 144 divisors (see below), whose sum is σ = 207673138449504. Its totient is φ = 17341718768640.

The previous prime is 66745408044773. The next prime is 66745408044781. The reversal of 66745408044780 is 8744080454766.

66745408044780 is a `hidden beast` number, since 6 + 6 + 7 + 4 + 540 + 8 + 0 + 4 + 4 + 7 + 80 = 666.

It is not an unprimeable number, because it can be changed into a prime (66745408044781) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 386982 + ... + 11560301.

It is an arithmetic number, because the mean of its divisors is an integer number (1442174572566).

Almost surely, 2^{66745408044780} is an apocalyptic number.

66745408044780 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 66745408044780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103836569224752).

66745408044780 is an abundant number, since it is smaller than the sum of its proper divisors (140927730404724).

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

66745408044780 is a wasteful number, since it uses less digits than its factorization.

66745408044780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11948096 (or 11948091 counting only the distinct ones).

The product of its (nonzero) digits is 144506880, while the sum is 63.

The spelling of 66745408044780 in words is "sixty-six trillion, seven hundred forty-five billion, four hundred eight million, forty-four thousand, seven hundred eighty".