18994358687 has 8 divisors (see below), whose sum is σ = 19033128576. Its totient is φ = 18955612672.

The previous prime is 18994358659. The next prime is 18994358699. The reversal of 18994358687 is 78685349981.

It is a happy number.

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 18994358687 - 2⁸ = 18994358431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994348687) 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, 3138098 + ... + 3144144.

It is an arithmetic number, because the mean of its divisors is an integer number (2379141072).

Almost surely, 2^18994358687 is an apocalyptic number.

18994358687 is a deficient number, since it is larger than the sum of its proper divisors (38769889).

18994358687 is an equidigital number, since it uses as much as digits as its factorization.

18994358687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11937.

The product of its digits is 104509440, while the sum is 68.

The spelling of 18994358687 in words is "eighteen billion, nine hundred ninety-four million, three hundred fifty-eight thousand, six hundred eighty-seven".