18968185387 has 4 divisors (see below), whose sum is σ = 20083961016. Its totient is φ = 17852409760.

The previous prime is 18968185381. The next prime is 18968185409. The reversal of 18968185387 is 78358186981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18968185387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18968185381) 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, 557887789 + ... + 557887822.

It is an arithmetic number, because the mean of its divisors is an integer number (5020990254).

Almost surely, 2^18968185387 is an apocalyptic number.

18968185387 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18968185387 is a deficient number, since it is larger than the sum of its proper divisors (1115775629).

18968185387 is a wasteful number, since it uses less digits than its factorization.

18968185387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115775628.

The product of its digits is 23224320, while the sum is 64.

The spelling of 18968185387 in words is "eighteen billion, nine hundred sixty-eight million, one hundred eighty-five thousand, three hundred eighty-seven".