16381586018 has 30 divisors (see below), whose sum is σ = 28681598571. Its totient is φ = 7016878596.

The previous prime is 16381586017. The next prime is 16381586027. The reversal of 16381586018 is 81068518361.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8190793009 + 8190793009 = 90503^2 + 90503^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=90503.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16381586017) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 8868371 + ... + 8870217.

Almost surely, 2^16381586018 is an apocalyptic number.

16381586018 is a deficient number, since it is larger than the sum of its proper divisors (12300012553).

16381586018 is an frugal number, since it uses more digits than its factorization.

16381586018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724 (or 1856 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 47.

The spelling of 16381586018 in words is "sixteen billion, three hundred eighty-one million, five hundred eighty-six thousand, eighteen".