18885986331678 has 24 divisors (see below), whose sum is σ = 42239625345216. Its totient is φ = 6092253655200.

The previous prime is 18885986331677. The next prime is 18885986331767. The reversal of 18885986331678 is 87613368958881.

18885986331678 is a `hidden beast` number, since 1 + 8 + 8 + 8 + 598 + 6 + 3 + 3 + 16 + 7 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18885986331597 and 18885986331606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18885986331677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16922926263 + ... + 16922927378.

It is an arithmetic number, because the mean of its divisors is an integer number (1759984389384).

Almost surely, 2^{18885986331678} is an apocalyptic number.

18885986331678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18885986331678 is an abundant number, since it is smaller than the sum of its proper divisors (23353639013538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18885986331678 is a wasteful number, since it uses less digits than its factorization.

18885986331678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33845853680 (or 33845853677 counting only the distinct ones).

The product of its digits is 3344302080, while the sum is 81.

The spelling of 18885986331678 in words is "eighteen trillion, eight hundred eighty-five billion, nine hundred eighty-six million, three hundred thirty-one thousand, six hundred seventy-eight".