18434439685 has 8 divisors (see below), whose sum is σ = 23422582296. Its totient is φ = 13880048640.

The previous prime is 18434439677. The next prime is 18434439707. The reversal of 18434439685 is 58693443481.

It can be written as a sum of positive squares in 4 ways, for example, as 4982383396 + 13452056289 = 70586^2 + 115983^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18434439685 - 2³ = 18434439677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108437796 + ... + 108437965.

It is an arithmetic number, because the mean of its divisors is an integer number (2927822787).

Almost surely, 2^18434439685 is an apocalyptic number.

It is an amenable number.

18434439685 is a deficient number, since it is larger than the sum of its proper divisors (4988142611).

18434439685 is a wasteful number, since it uses less digits than its factorization.

18434439685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216875783.

The product of its digits is 9953280, while the sum is 55.

The spelling of 18434439685 in words is "eighteen billion, four hundred thirty-four million, four hundred thirty-nine thousand, six hundred eighty-five".