18046131685 has 8 divisors (see below), whose sum is σ = 21775001976. Its totient is φ = 14357142720.

The previous prime is 18046131643. The next prime is 18046131709. The reversal of 18046131685 is 58613164081.

It can be written as a sum of positive squares in 4 ways, for example, as 712302721 + 17333828964 = 26689^2 + 131658^2 .

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

It is not a de Polignac number, because 18046131685 - 2¹³ = 18046123493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 9969334 + ... + 9971143.

It is an arithmetic number, because the mean of its divisors is an integer number (2721875247).

Almost surely, 2^18046131685 is an apocalyptic number.

It is an amenable number.

18046131685 is a deficient number, since it is larger than the sum of its proper divisors (3728870291).

18046131685 is a wasteful number, since it uses less digits than its factorization.

18046131685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19940663.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 18046131685 in words is "eighteen billion, forty-six million, one hundred thirty-one thousand, six hundred eighty-five".