66654844845666 has 96 divisors (see below), whose sum is σ = 169213227785280. Its totient is φ = 17308750233600.

The previous prime is 66654844845649. The next prime is 66654844845671.

66654844845666 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66654844845591 and 66654844845600.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10857346 + ... + 15849026.

It is an arithmetic number, because the mean of its divisors is an integer number (1762637789430).

Almost surely, 2^{66654844845666} is an apocalyptic number.

66654844845666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66654844845666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84606613892640).

66654844845666 is an abundant number, since it is smaller than the sum of its proper divisors (102558382939614).

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

66654844845666 is a wasteful number, since it uses less digits than its factorization.

66654844845666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4995840 (or 4995833 counting only the distinct ones).

The product of its digits is 19110297600, while the sum is 78.

The spelling of 66654844845666 in words is "sixty-six trillion, six hundred fifty-four billion, eight hundred forty-four million, eight hundred forty-five thousand, six hundred sixty-six".