18026416728778 has 8 divisors (see below), whose sum is σ = 28630191275172. Its totient is φ = 8483019637056.

The previous prime is 18026416728751. The next prime is 18026416728797. The reversal of 18026416728778 is 87782761462081.

It can be written as a sum of positive squares in 2 ways, for example, as 17985427891929 + 40988836849 = 4240923^2 + 202457^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 265094363625 + ... + 265094363692.

Almost surely, 2^{18026416728778} is an apocalyptic number.

18026416728778 is a deficient number, since it is larger than the sum of its proper divisors (10603774546394).

18026416728778 is a wasteful number, since it uses less digits than its factorization.

18026416728778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530188727336.

The product of its (nonzero) digits is 101154816, while the sum is 67.

The spelling of 18026416728778 in words is "eighteen trillion, twenty-six billion, four hundred sixteen million, seven hundred twenty-eight thousand, seven hundred seventy-eight".