18438073378 has 8 divisors (see below), whose sum is σ = 28110505500. Its totient is φ = 9067904880.

The previous prime is 18438073373. The next prime is 18438073399. The reversal of 18438073378 is 87337083481.

It can be written as a sum of positive squares in 2 ways, for example, as 12268442169 + 6169631209 = 110763^2 + 78547^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18438073373) 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 3 ways as a sum of consecutive naturals, for example, 75565753 + ... + 75565996.

Almost surely, 2^18438073378 is an apocalyptic number.

18438073378 is a deficient number, since it is larger than the sum of its proper divisors (9672432122).

18438073378 is a wasteful number, since it uses less digits than its factorization.

18438073378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151131812.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 18438073378 in words is "eighteen billion, four hundred thirty-eight million, seventy-three thousand, three hundred seventy-eight".