1666356606120 has 32 divisors (see below), whose sum is σ = 4999069818720. Its totient is φ = 444361761600.

The previous prime is 1666356606119. The next prime is 1666356606133. The reversal of 1666356606120 is 216066536661.

It is a self number, because there is not a number n which added to its sum of digits gives 1666356606120.

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 7 ways as a sum of consecutive naturals, for example, 6943152406 + ... + 6943152645.

It is an arithmetic number, because the mean of its divisors is an integer number (156220931835).

Almost surely, 2^{1666356606120} is an apocalyptic number.

1666356606120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666356606120 is an abundant number, since it is smaller than the sum of its proper divisors (3332713212600).

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

1666356606120 is a wasteful number, since it uses less digits than its factorization.

1666356606120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13886305065 (or 13886305061 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 1666356606120 in words is "one trillion, six hundred sixty-six billion, three hundred fifty-six million, six hundred six thousand, one hundred twenty".