18222985440 has 1152 divisors, whose sum is σ = 77441495040. Its totient is φ = 3848601600.

The previous prime is 18222985397. The next prime is 18222985441. The reversal of 18222985440 is 4458922281.

18222985440 is a `hidden beast` number, since 1 + 82 + 2 + 29 + 8 + 544 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18222985441) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 308864131 + ... + 308864189.

It is an arithmetic number, because the mean of its divisors is an integer number (67223520).

Almost surely, 2^18222985440 is an apocalyptic number.

18222985440 is a gapful number since it is divisible by the number (10) 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 18222985440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38720747520).

18222985440 is an abundant number, since it is smaller than the sum of its proper divisors (59218509600).

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

18222985440 is a wasteful number, since it uses less digits than its factorization.

18222985440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 18222985440 in words is "eighteen billion, two hundred twenty-two million, nine hundred eighty-five thousand, four hundred forty".