18665910336678 has 128 divisors (see below), whose sum is σ = 42667559460864. Its totient is φ = 5388633676800.

The previous prime is 18665910336673. The next prime is 18665910336739. The reversal of 18665910336678 is 87663301956681.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18665910336673) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 605686326 + ... + 605717142.

It is an arithmetic number, because the mean of its divisors is an integer number (333340308288).

Almost surely, 2^{18665910336678} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18665910336678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21333779730432).

18665910336678 is an abundant number, since it is smaller than the sum of its proper divisors (24001649124186).

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

18665910336678 is a wasteful number, since it uses less digits than its factorization.

18665910336678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32450.

The product of its (nonzero) digits is 235146240, while the sum is 69.

The spelling of 18665910336678 in words is "eighteen trillion, six hundred sixty-five billion, nine hundred ten million, three hundred thirty-six thousand, six hundred seventy-eight".