18706367905 has 4 divisors (see below), whose sum is σ = 22447641492. Its totient is φ = 14965094320.

The previous prime is 18706367903. The next prime is 18706367917. The reversal of 18706367905 is 50976360781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50976360781 = 113 ⋅451118237.

It can be written as a sum of positive squares in 2 ways, for example, as 6427068561 + 12279299344 = 80169^2 + 110812^2 .

It is not a de Polignac number, because 18706367905 - 2¹ = 18706367903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18706367903) 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 3 ways as a sum of consecutive naturals, for example, 1870636786 + ... + 1870636795.

It is an arithmetic number, because the mean of its divisors is an integer number (5611910373).

Almost surely, 2^18706367905 is an apocalyptic number.

It is an amenable number.

18706367905 is a deficient number, since it is larger than the sum of its proper divisors (3741273587).

18706367905 is an equidigital number, since it uses as much as digits as its factorization.

18706367905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741273586.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 18706367905 in words is "eighteen billion, seven hundred six million, three hundred sixty-seven thousand, nine hundred five".