18331122378 has 16 divisors (see below), whose sum is σ = 36797533056. Its totient is φ = 6087826080.

The previous prime is 18331122373. The next prime is 18331122379. The reversal of 18331122378 is 87322113381.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18331122373) 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 7 ways as a sum of consecutive naturals, for example, 5635251 + ... + 5638502.

It is an arithmetic number, because the mean of its divisors is an integer number (2299845816).

Almost surely, 2^18331122378 is an apocalyptic number.

18331122378 is an abundant number, since it is smaller than the sum of its proper divisors (18466410678).

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

18331122378 is a wasteful number, since it uses less digits than its factorization.

18331122378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11274029.

The product of its digits is 48384, while the sum is 39.

It can be divided in two parts, 1833 and 1122378, that added together give a palindrome (1124211).

The spelling of 18331122378 in words is "eighteen billion, three hundred thirty-one million, one hundred twenty-two thousand, three hundred seventy-eight".