18167229728 has 18 divisors (see below), whose sum is σ = 35768234691. Its totient is φ = 9083233632.

The previous prime is 18167229727. The next prime is 18167229737. The reversal of 18167229728 is 82792276181.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 9083614864 + 9083614864 = 95308^2 + 95308^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=95308.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18167229728.

It is not an unprimeable number, because it can be changed into a prime (18167229727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 750551 + ... + 774377.

Almost surely, 2^18167229728 is an apocalyptic number.

It is an amenable number.

18167229728 is a deficient number, since it is larger than the sum of its proper divisors (17601004963).

18167229728 is an frugal number, since it uses more digits than its factorization.

18167229728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47664 (or 23829 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 53.

The spelling of 18167229728 in words is "eighteen billion, one hundred sixty-seven million, two hundred twenty-nine thousand, seven hundred twenty-eight".