66869712000 has 1728 divisors, whose sum is σ = 312397034040. Its totient is φ = 14108774400.

The previous prime is 66869711999. The next prime is 66869712011. The reversal of 66869712000 is 21796866.

66869712000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9073705536 + 57796006464 = 95256^2 + 240408^2 .

It is a tau number, because it is divible by the number of its divisors (1728).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 5143823994 + ... + 5143824006.

Almost surely, 2^66869712000 is an apocalyptic number.

66869712000 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 66869712000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156198517020).

66869712000 is an abundant number, since it is smaller than the sum of its proper divisors (245527322040).

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

66869712000 is an frugal number, since it uses more digits than its factorization.

66869712000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 66869712000 in words is "sixty-six billion, eight hundred sixty-nine million, seven hundred twelve thousand".