1666005432784 has 80 divisors (see below), whose sum is σ = 4024610979840. Its totient is φ = 649055249280.

The previous prime is 1666005432769. The next prime is 1666005432827. The reversal of 1666005432784 is 4872345006661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31195897 + ... + 31249255.

It is an arithmetic number, because the mean of its divisors is an integer number (50307637248).

Almost surely, 2^{1666005432784} is an apocalyptic number.

1666005432784 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1666005432784 is an abundant number, since it is smaller than the sum of its proper divisors (2358605547056).

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

1666005432784 is a wasteful number, since it uses less digits than its factorization.

1666005432784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78728 (or 78722 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 52.

The spelling of 1666005432784 in words is "one trillion, six hundred sixty-six billion, five million, four hundred thirty-two thousand, seven hundred eighty-four".