66996545280 has 1152 divisors, whose sum is σ = 270581907456. Its totient is φ = 13801881600.

The previous prime is 66996545261. The next prime is 66996545309. The reversal of 66996545280 is 8254569966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1264085734 + ... + 1264085786.

It is an arithmetic number, because the mean of its divisors is an integer number (234880128).

Almost surely, 2^66996545280 is an apocalyptic number.

66996545280 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 66996545280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135290953728).

66996545280 is an abundant number, since it is smaller than the sum of its proper divisors (203585362176).

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

66996545280 is a wasteful number, since it uses less digits than its factorization.

66996545280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 60.

The spelling of 66996545280 in words is "sixty-six billion, nine hundred ninety-six million, five hundred forty-five thousand, two hundred eighty".