66708065280 has 176 divisors, whose sum is σ = 225913142880. Its totient is φ = 16742350848.

The previous prime is 66708065209. The next prime is 66708065287. The reversal of 66708065280 is 8256080766.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (66708065287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133386 + ... + 388854.

Almost surely, 2^66708065280 is an apocalyptic number.

66708065280 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 66708065280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112956571440).

66708065280 is an abundant number, since it is smaller than the sum of its proper divisors (159205077600).

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

66708065280 is a wasteful number, since it uses less digits than its factorization.

66708065280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255514 (or 255496 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 66708065280 in words is "sixty-six billion, seven hundred eight million, sixty-five thousand, two hundred eighty".