66674247666 has 64 divisors (see below), whose sum is σ = 146524726656. Its totient is φ = 20102400000.

The previous prime is 66674247637. The next prime is 66674247671.

66674247666 is nontrivially palindromic in base 10.

66674247666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 720541 + ... + 807791.

It is an arithmetic number, because the mean of its divisors is an integer number (2289448854).

Almost surely, 2^66674247666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66674247666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73262363328).

66674247666 is an abundant number, since it is smaller than the sum of its proper divisors (79850478990).

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

66674247666 is a wasteful number, since it uses less digits than its factorization.

66674247666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87467.

The product of its digits is 73156608, while the sum is 60.

The spelling of 66674247666 in words is "sixty-six billion, six hundred seventy-four million, two hundred forty-seven thousand, six hundred sixty-six".