18718586305 has 4 divisors (see below), whose sum is σ = 22462303572. Its totient is φ = 14974869040.

The previous prime is 18718586221. The next prime is 18718586311. The reversal of 18718586305 is 50368581781.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6874399744 + 11844186561 = 82912^2 + 108831^2 .

It is not a de Polignac number, because 18718586305 - 2¹⁵ = 18718553537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1871858626 + ... + 1871858635.

It is an arithmetic number, because the mean of its divisors is an integer number (5615575893).

Almost surely, 2^18718586305 is an apocalyptic number.

It is an amenable number.

18718586305 is a deficient number, since it is larger than the sum of its proper divisors (3743717267).

18718586305 is an equidigital number, since it uses as much as digits as its factorization.

18718586305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743717266.

The product of its (nonzero) digits is 1612800, while the sum is 52.

The spelling of 18718586305 in words is "eighteen billion, seven hundred eighteen million, five hundred eighty-six thousand, three hundred five".