18660221225712 has 200 divisors, whose sum is σ = 58928874977280. Its totient is φ = 5653561173120.

The previous prime is 18660221225693. The next prime is 18660221225713. The reversal of 18660221225712 is 21752212206681.

18660221225712 is a `hidden beast` number, since 1 + 8 + 6 + 60 + 2 + 2 + 12 + 2 + 571 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18660221225713) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 78331839 + ... + 78569697.

Almost surely, 2^{18660221225712} is an apocalyptic number.

18660221225712 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 18660221225712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29464437488640).

18660221225712 is an abundant number, since it is smaller than the sum of its proper divisors (40268653751568).

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

18660221225712 is a wasteful number, since it uses less digits than its factorization.

18660221225712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243393 (or 243378 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 18660221225712 in words is "eighteen trillion, six hundred sixty billion, two hundred twenty-one million, two hundred twenty-five thousand, seven hundred twelve".