18434439686 has 32 divisors (see below), whose sum is σ = 30994760160. Its totient is φ = 8164364544.

The previous prime is 18434439677. The next prime is 18434439707. The reversal of 18434439686 is 68693443481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47906 + ... + 197898.

It is an arithmetic number, because the mean of its divisors is an integer number (968586255).

Almost surely, 2^18434439686 is an apocalyptic number.

18434439686 is a deficient number, since it is larger than the sum of its proper divisors (12560320474).

18434439686 is a wasteful number, since it uses less digits than its factorization.

18434439686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150200.

The product of its digits is 11943936, while the sum is 56.

The spelling of 18434439686 in words is "eighteen billion, four hundred thirty-four million, four hundred thirty-nine thousand, six hundred eighty-six".