66799534080 has 336 divisors, whose sum is σ = 222264451584. Its totient is φ = 17112760320.

The previous prime is 66799534037. The next prime is 66799534093. The reversal of 66799534080 is 8043599766.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66799534080.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 487587772 + ... + 487587908.

It is an arithmetic number, because the mean of its divisors is an integer number (661501344).

Almost surely, 2^66799534080 is an apocalyptic number.

66799534080 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 66799534080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111132225792).

66799534080 is an abundant number, since it is smaller than the sum of its proper divisors (155464917504).

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

66799534080 is an frugal number, since it uses more digits than its factorization.

66799534080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 66799534080 in words is "sixty-six billion, seven hundred ninety-nine million, five hundred thirty-four thousand, eighty".