18813423538 has 16 divisors (see below), whose sum is σ = 34732474560. Its totient is φ = 7442672976.

The previous prime is 18813423533. The next prime is 18813423539. The reversal of 18813423538 is 83532431881.

It is not an unprimeable number, because it can be changed into a prime (18813423533) 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, 51685048 + ... + 51685411.

It is an arithmetic number, because the mean of its divisors is an integer number (2170779660).

Almost surely, 2^18813423538 is an apocalyptic number.

18813423538 is a deficient number, since it is larger than the sum of its proper divisors (15919051022).

18813423538 is a wasteful number, since it uses less digits than its factorization.

18813423538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103370481.

The product of its digits is 552960, while the sum is 46.

The spelling of 18813423538 in words is "eighteen billion, eight hundred thirteen million, four hundred twenty-three thousand, five hundred thirty-eight".