66474542720 has 64 divisors (see below), whose sum is σ = 159063035040. Its totient is φ = 26565166080.

The previous prime is 66474542599. The next prime is 66474542749. The reversal of 66474542720 is 2724547466.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650639 + ... + 745841.

Almost surely, 2^66474542720 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 66474542720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79531517520).

66474542720 is an abundant number, since it is smaller than the sum of its proper divisors (92588492320).

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

66474542720 is a wasteful number, since it uses less digits than its factorization.

66474542720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96313 (or 96301 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 47.

The spelling of 66474542720 in words is "sixty-six billion, four hundred seventy-four million, five hundred forty-two thousand, seven hundred twenty".