18223615872 has 576 divisors, whose sum is σ = 69075901440. Its totient is φ = 4729052160.

The previous prime is 18223615859. The next prime is 18223615873. The reversal of 18223615872 is 27851632281.

18223615872 is a `hidden beast` number, since 1 + 8 + 2 + 2 + 3 + 61 + 587 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18223615873) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16764513 + ... + 16765599.

It is an arithmetic number, because the mean of its divisors is an integer number (119923440).

Almost surely, 2^18223615872 is an apocalyptic number.

18223615872 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 18223615872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34537950720).

18223615872 is an abundant number, since it is smaller than the sum of its proper divisors (50852285568).

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

18223615872 is a wasteful number, since it uses less digits than its factorization.

18223615872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141 (or 1110 counting only the distinct ones).

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

The spelling of 18223615872 in words is "eighteen billion, two hundred twenty-three million, six hundred fifteen thousand, eight hundred seventy-two".