18639055187 has 8 divisors (see below), whose sum is σ = 19736978400. Its totient is φ = 17541299584.

The previous prime is 18639055181. The next prime is 18639055199. The reversal of 18639055187 is 78155093681.

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

It is not a de Polignac number, because 18639055187 - 2¹⁰ = 18639054163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18639055181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242114 + ... + 309672.

It is an arithmetic number, because the mean of its divisors is an integer number (2467122300).

Almost surely, 2^18639055187 is an apocalyptic number.

18639055187 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18639055187 is a deficient number, since it is larger than the sum of its proper divisors (1097923213).

18639055187 is a wasteful number, since it uses less digits than its factorization.

18639055187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83805.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 18639055187 in words is "eighteen billion, six hundred thirty-nine million, fifty-five thousand, one hundred eighty-seven".