18383531712 has 224 divisors, whose sum is σ = 61797249024. Its totient is φ = 4691865600.

The previous prime is 18383531671. The next prime is 18383531713. The reversal of 18383531712 is 21713538381.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×18383531712² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (18383531713) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 524662 + ... + 558602.

It is an arithmetic number, because the mean of its divisors is an integer number (275880576).

Almost surely, 2^18383531712 is an apocalyptic number.

18383531712 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 18383531712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30898624512).

18383531712 is an abundant number, since it is smaller than the sum of its proper divisors (43413717312).

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

18383531712 is a wasteful number, since it uses less digits than its factorization.

18383531712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34007 (or 33997 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The spelling of 18383531712 in words is "eighteen billion, three hundred eighty-three million, five hundred thirty-one thousand, seven hundred twelve".