66660165726480 has 240 divisors, whose sum is σ = 225151097693184. Its totient is φ = 17674178273280.

The previous prime is 66660165726419. The next prime is 66660165726481. The reversal of 66660165726480 is 8462756106666.

It is a tau number, because it is divible by the number of its divisors (240).

It is not an unprimeable number, because it can be changed into a prime (66660165726481) 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, 278633472 + ... + 278872608.

Almost surely, 2^{66660165726480} is an apocalyptic number.

66660165726480 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 66660165726480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112575548846592).

66660165726480 is an abundant number, since it is smaller than the sum of its proper divisors (158490931966704).

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

66660165726480 is a wasteful number, since it uses less digits than its factorization.

66660165726480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241374 (or 241365 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 63.

The spelling of 66660165726480 in words is "sixty-six trillion, six hundred sixty billion, one hundred sixty-five million, seven hundred twenty-six thousand, four hundred eighty".