18949543178889 has 8 divisors (see below), whose sum is σ = 25266901947840. Its totient is φ = 12632606597936.

The previous prime is 18949543178851. The next prime is 18949543179029. The reversal of 18949543178889 is 98887134594981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18949543178889 - 2⁸ = 18949543178633 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18949543178849) 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 7 ways as a sum of consecutive naturals, for example, 105442254 + ... + 105621815.

It is an arithmetic number, because the mean of its divisors is an integer number (3158362743480).

Almost surely, 2^{18949543178889} is an apocalyptic number.

It is an amenable number.

18949543178889 is a deficient number, since it is larger than the sum of its proper divisors (6317358768951).

18949543178889 is a wasteful number, since it uses less digits than its factorization.

18949543178889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211093999.

The product of its digits is 5016453120, while the sum is 84.

The spelling of 18949543178889 in words is "eighteen trillion, nine hundred forty-nine billion, five hundred forty-three million, one hundred seventy-eight thousand, eight hundred eighty-nine".