18705723685 has 16 divisors (see below), whose sum is σ = 24729950592. Its totient is φ = 13469464000.

The previous prime is 18705723667. The next prime is 18705723689. The reversal of 18705723685 is 58632750781.

It is a happy number.

It is not a de Polignac number, because 18705723685 - 2⁷ = 18705723557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705723689) 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 15 ways as a sum of consecutive naturals, for example, 1678129 + ... + 1689238.

It is an arithmetic number, because the mean of its divisors is an integer number (1545621912).

Almost surely, 2^18705723685 is an apocalyptic number.

It is an amenable number.

18705723685 is a deficient number, since it is larger than the sum of its proper divisors (6024226907).

18705723685 is a wasteful number, since it uses less digits than its factorization.

18705723685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367484.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 18705723685 in words is "eighteen billion, seven hundred five million, seven hundred twenty-three thousand, six hundred eighty-five".