18705513838 has 32 divisors (see below), whose sum is σ = 30854234880. Its totient is φ = 8434493760.

The previous prime is 18705513829. The next prime is 18705513839. The reversal of 18705513838 is 83831550781.

It is a junction number, because it is equal to n+sod(n) for n = 18705513791 and 18705513800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705513839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7022895 + ... + 7025557.

It is an arithmetic number, because the mean of its divisors is an integer number (964194840).

Almost surely, 2^18705513838 is an apocalyptic number.

18705513838 is a deficient number, since it is larger than the sum of its proper divisors (12148721042).

18705513838 is a wasteful number, since it uses less digits than its factorization.

18705513838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5112.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 18705513838 in words is "eighteen billion, seven hundred five million, five hundred thirteen thousand, eight hundred thirty-eight".