1666284377472 has 192 divisors, whose sum is σ = 5633177855760. Its totient is φ = 466093486080.

The previous prime is 1666284377441. The next prime is 1666284377477. The reversal of 1666284377472 is 2747734826661.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-3 number, since 3×1666284377472³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666284377477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4892703 + ... + 5222174.

Almost surely, 2^{1666284377472} is an apocalyptic number.

1666284377472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666284377472 is an abundant number, since it is smaller than the sum of its proper divisors (3966893478288).

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

1666284377472 is a wasteful number, since it uses less digits than its factorization.

1666284377472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10114921 (or 10114906 counting only the distinct ones).

The product of its digits is 113799168, while the sum is 63.

The spelling of 1666284377472 in words is "one trillion, six hundred sixty-six billion, two hundred eighty-four million, three hundred seventy-seven thousand, four hundred seventy-two".