18161459712 has 400 divisors, whose sum is σ = 60639806304. Its totient is φ = 5363712000.

The previous prime is 18161459683. The next prime is 18161459713. The reversal of 18161459712 is 21795416181.

18161459712 is a `hidden beast` number, since 18 + 1 + 614 + 5 + 9 + 7 + 12 = 666.

It is not an unprimeable number, because it can be changed into a prime (18161459713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18703387 + ... + 18704357.

Almost surely, 2^18161459712 is an apocalyptic number.

18161459712 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 18161459712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30319903152).

18161459712 is an abundant number, since it is smaller than the sum of its proper divisors (42478346592).

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

18161459712 is an equidigital number, since it uses as much as digits as its factorization.

18161459712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053 (or 1028 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The spelling of 18161459712 in words is "eighteen billion, one hundred sixty-one million, four hundred fifty-nine thousand, seven hundred twelve".