18668355072 has 80 divisors (see below), whose sum is σ = 49850298960. Its totient is φ = 6208192512.

The previous prime is 18668355011. The next prime is 18668355073. The reversal of 18668355072 is 27055386681.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18668355073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651054 + ... + 679122.

It is an arithmetic number, because the mean of its divisors is an integer number (623128737).

Almost surely, 2^18668355072 is an apocalyptic number.

18668355072 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 18668355072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24925149480).

18668355072 is an abundant number, since it is smaller than the sum of its proper divisors (31181943888).

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

18668355072 is an equidigital number, since it uses as much as digits as its factorization.

18668355072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28523 (or 28507 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 18668355072 in words is "eighteen billion, six hundred sixty-eight million, three hundred fifty-five thousand, seventy-two".