18351667728 has 30 divisors (see below), whose sum is σ = 51359181614. Its totient is φ = 6117222528.

The previous prime is 18351667717. The next prime is 18351667751. The reversal of 18351667728 is 82776615381.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15782394384 + 2569273344 = 125628^2 + 50688^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63720925 + ... + 63721212.

Almost surely, 2^18351667728 is an apocalyptic number.

18351667728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18351667728 is an abundant number, since it is smaller than the sum of its proper divisors (33007513886).

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

18351667728 is a wasteful number, since it uses less digits than its factorization.

18351667728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127442151 (or 127442142 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 18351667728 in words is "eighteen billion, three hundred fifty-one million, six hundred sixty-seven thousand, seven hundred twenty-eight".