18666950836 has 6 divisors (see below), whose sum is σ = 32667163970. Its totient is φ = 9333475416.

The previous prime is 18666950789. The next prime is 18666950851. The reversal of 18666950836 is 63805966681.

It can be written as a sum of positive squares in only one way, i.e., 13367984400 + 5298966436 = 115620^2 + 72794^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2333368851 + ... + 2333368858.

Almost surely, 2^18666950836 is an apocalyptic number.

It is an amenable number.

18666950836 is a deficient number, since it is larger than the sum of its proper divisors (14000213134).

18666950836 is a wasteful number, since it uses less digits than its factorization.

18666950836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4666737713 (or 4666737711 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 58.

The spelling of 18666950836 in words is "eighteen billion, six hundred sixty-six million, nine hundred fifty thousand, eight hundred thirty-six".