1666685164 has 12 divisors (see below), whose sum is σ = 2918095488. Its totient is φ = 832943600.

The previous prime is 1666685161. The next prime is 1666685171. The reversal of 1666685164 is 4615866661.

It is not an unprimeable number, because it can be changed into a prime (1666685161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90247 + ... + 107134.

It is an arithmetic number, because the mean of its divisors is an integer number (243174624).

Almost surely, 2^1666685164 is an apocalyptic number.

It is an amenable number.

1666685164 is a deficient number, since it is larger than the sum of its proper divisors (1251410324).

1666685164 is a wasteful number, since it uses less digits than its factorization.

1666685164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199496 (or 199494 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The square root of 1666685164 is about 40825.0555908991. The cubic root of 1666685164 is about 1185.6354876832.

The spelling of 1666685164 in words is "one billion, six hundred sixty-six million, six hundred eighty-five thousand, one hundred sixty-four".