18418622478 has 32 divisors (see below), whose sum is σ = 37989285120. Its totient is φ = 5950465920.

The previous prime is 18418622473. The next prime is 18418622543. The reversal of 18418622478 is 87422681481.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18418622478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418622473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341275 + ... + 391542.

It is an arithmetic number, because the mean of its divisors is an integer number (1187165160).

Almost surely, 2^18418622478 is an apocalyptic number.

18418622478 is an abundant number, since it is smaller than the sum of its proper divisors (19570662642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18418622478 is a wasteful number, since it uses less digits than its factorization.

18418622478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732952.

The product of its digits is 1376256, while the sum is 51.

The spelling of 18418622478 in words is "eighteen billion, four hundred eighteen million, six hundred twenty-two thousand, four hundred seventy-eight".