19385449937218 has 8 divisors (see below), whose sum is σ = 29487726665280. Its totient is φ = 9556207715460.

The previous prime is 19385449937213. The next prime is 19385449937237. The reversal of 19385449937218 is 81273994458391.

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

It is not an unprimeable number, because it can be changed into a prime (19385449937213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68258626398 + ... + 68258626681.

It is an arithmetic number, because the mean of its divisors is an integer number (3685965833160).

Almost surely, 2^{19385449937218} is an apocalyptic number.

19385449937218 is a deficient number, since it is larger than the sum of its proper divisors (10102276728062).

19385449937218 is a wasteful number, since it uses less digits than its factorization.

19385449937218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136517253152.

The product of its digits is 470292480, while the sum is 73.

The spelling of 19385449937218 in words is "nineteen trillion, three hundred eighty-five billion, four hundred forty-nine million, nine hundred thirty-seven thousand, two hundred eighteen".