2066866945920 has 576 divisors, whose sum is σ = 8311066255440. Its totient is φ = 471933665280.

The previous prime is 2066866945873. The next prime is 2066866945961. The reversal of 2066866945920 is 295496686602.

2066866945920 is a `hidden beast` number, since 20 + 6 + 6 + 86 + 69 + 459 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 316952260 + ... + 316958780.

Almost surely, 2^{2066866945920} is an apocalyptic number.

2066866945920 is a gapful number since it is divisible by the number (20) 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 2066866945920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4155533127720).

2066866945920 is an abundant number, since it is smaller than the sum of its proper divisors (6244199309520).

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

2066866945920 is a wasteful number, since it uses less digits than its factorization.

2066866945920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7683 (or 7661 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 63.

The spelling of 2066866945920 in words is "two trillion, sixty-six billion, eight hundred sixty-six million, nine hundred forty-five thousand, nine hundred twenty".