18178919579 has 16 divisors (see below), whose sum is σ = 19474896000. Its totient is φ = 16917310080.

The previous prime is 18178919557. The next prime is 18178919593. The reversal of 18178919579 is 97591987181.

It is a cyclic number.

It is not a de Polignac number, because 18178919579 - 2¹² = 18178915483 is a prime.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18178919509) 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 15 ways as a sum of consecutive naturals, for example, 1663724 + ... + 1674614.

It is an arithmetic number, because the mean of its divisors is an integer number (1217181000).

Almost surely, 2^18178919579 is an apocalyptic number.

18178919579 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18178919579 is a deficient number, since it is larger than the sum of its proper divisors (1295976421).

18178919579 is a wasteful number, since it uses less digits than its factorization.

18178919579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12458.

The product of its digits is 11430720, while the sum is 65.

The spelling of 18178919579 in words is "eighteen billion, one hundred seventy-eight million, nine hundred nineteen thousand, five hundred seventy-nine".