18219219632 has 60 divisors (see below), whose sum is σ = 37108968624. Its totient is φ = 8648830080.

The previous prime is 18219219631. The next prime is 18219219659. The reversal of 18219219632 is 23691291281.

Its product of digits (93312) is a multiple of the sum of its prime divisors (729).

It is not an unprimeable number, because it can be changed into a prime (18219219631) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 34835723 + ... + 34836245.

Almost surely, 2^18219219632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18219219632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18554484312).

18219219632 is an abundant number, since it is smaller than the sum of its proper divisors (18889748992).

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

18219219632 is an equidigital number, since it uses as much as digits as its factorization.

18219219632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258 (or 729 counting only the distinct ones).

The product of its digits is 93312, while the sum is 44.

The spelling of 18219219632 in words is "eighteen billion, two hundred nineteen million, two hundred nineteen thousand, six hundred thirty-two".