18705018386 has 16 divisors (see below), whose sum is σ = 29028291840. Its totient is φ = 9028993680.

The previous prime is 18705018379. The next prime is 18705018389. The reversal of 18705018386 is 68381050781.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18705018386.

It is not an unprimeable number, because it can be changed into a prime (18705018389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 897221 + ... + 917831.

It is an arithmetic number, because the mean of its divisors is an integer number (1814268240).

Almost surely, 2^18705018386 is an apocalyptic number.

18705018386 is a deficient number, since it is larger than the sum of its proper divisors (10323273454).

18705018386 is a wasteful number, since it uses less digits than its factorization.

18705018386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36289.

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 18705018386 in words is "eighteen billion, seven hundred five million, eighteen thousand, three hundred eighty-six".