18424844378 has 8 divisors (see below), whose sum is σ = 27637860180. Its totient is φ = 9212224320.

The previous prime is 18424844371. The next prime is 18424844381. The reversal of 18424844378 is 87344842481.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14603997409 + 3820846969 = 120847^2 + 61813^2 .

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 (18424844371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88418 + ... + 211346.

Almost surely, 2^18424844378 is an apocalyptic number.

18424844378 is a deficient number, since it is larger than the sum of its proper divisors (9213015802).

18424844378 is a wasteful number, since it uses less digits than its factorization.

18424844378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197872.

The product of its digits is 5505024, while the sum is 53.

The spelling of 18424844378 in words is "eighteen billion, four hundred twenty-four million, eight hundred forty-four thousand, three hundred seventy-eight".