66521429000 has 128 divisors (see below), whose sum is σ = 169656439680. Its totient is φ = 24265440000.

The previous prime is 66521428997. The next prime is 66521429033. The reversal of 66521429000 is 92412566.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1048175 + ... + 1109825.

It is an arithmetic number, because the mean of its divisors is an integer number (1325440935).

Almost surely, 2^66521429000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66521429000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84828219840).

66521429000 is an abundant number, since it is smaller than the sum of its proper divisors (103135010680).

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

66521429000 is a wasteful number, since it uses less digits than its factorization.

66521429000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61768 (or 61754 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 66521429000 in words is "sixty-six billion, five hundred twenty-one million, four hundred twenty-nine thousand".