18654571665612 has 144 divisors (see below), whose sum is σ = 52577302901760. Its totient is φ = 5542169071104.

The previous prime is 18654571665599. The next prime is 18654571665623. The reversal of 18654571665612 is 21656617545681.

18654571665612 is a `hidden beast` number, since 1 + 8 + 6 + 5 + 4 + 5 + 7 + 1 + 6 + 6 + 5 + 612 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 18654571665612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28784413 + ... + 29425355.

It is an arithmetic number, because the mean of its divisors is an integer number (365120159040).

Almost surely, 2^{18654571665612} is an apocalyptic number.

18654571665612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18654571665612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26288651450880).

18654571665612 is an abundant number, since it is smaller than the sum of its proper divisors (33922731236148).

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

18654571665612 is a wasteful number, since it uses less digits than its factorization.

18654571665612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643492 (or 643487 counting only the distinct ones).

The product of its digits is 72576000, while the sum is 63.

The spelling of 18654571665612 in words is "eighteen trillion, six hundred fifty-four billion, five hundred seventy-one million, six hundred sixty-five thousand, six hundred twelve".