18221223562560 has 168 divisors, whose sum is σ = 63166909618176. Its totient is φ = 4820733066240.

The previous prime is 18221223562559. The next prime is 18221223562603. The reversal of 18221223562560 is 6526532212281.

18221223562560 is a `hidden beast` number, since 1 + 8 + 2 + 2 + 1 + 2 + 23 + 5 + 62 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 24542956 + ... + 25274475.

It is an arithmetic number, because the mean of its divisors is an integer number (375993509632).

Almost surely, 2^{18221223562560} is an apocalyptic number.

18221223562560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18221223562560 is an abundant number, since it is smaller than the sum of its proper divisors (44945686055616).

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

18221223562560 is a wasteful number, since it uses less digits than its factorization.

18221223562560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49817581 (or 49817568 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 18221223562560 in words is "eighteen trillion, two hundred twenty-one billion, two hundred twenty-three million, five hundred sixty-two thousand, five hundred sixty".