1994546666 has 12 divisors (see below), whose sum is σ = 3480280578. Its totient is φ = 854805672.

The previous prime is 1994546629. The next prime is 1994546669. The reversal of 1994546666 is 6666454991.

It can be written as a sum of positive squares in only one way, i.e., 1929405625 + 65141041 = 43925^2 + 8071^2 .

It is not an unprimeable number, because it can be changed into a prime (1994546669) 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 5 ways as a sum of consecutive naturals, for example, 10176161 + ... + 10176356.

Almost surely, 2^1994546666 is an apocalyptic number.

1994546666 is a deficient number, since it is larger than the sum of its proper divisors (1485733912).

1994546666 is a wasteful number, since it uses less digits than its factorization.

1994546666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20352533 (or 20352526 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 56.

The square root of 1994546666 is about 44660.3478042883. The cubic root of 1994546666 is about 1258.7748791377.

The spelling of 1994546666 in words is "one billion, nine hundred ninety-four million, five hundred forty-six thousand, six hundred sixty-six".