18353516705 has 4 divisors (see below), whose sum is σ = 22024220052. Its totient is φ = 14682813360.

The previous prime is 18353516663. The next prime is 18353516717. The reversal of 18353516705 is 50761535381.

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 5964936289 + 12388580416 = 77233^2 + 111304^2 .

It is not a de Polignac number, because 18353516705 - 2¹⁸ = 18353254561 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, 1835351666 + ... + 1835351675.

It is an arithmetic number, because the mean of its divisors is an integer number (5506055013).

Almost surely, 2^18353516705 is an apocalyptic number.

It is an amenable number.

18353516705 is a deficient number, since it is larger than the sum of its proper divisors (3670703347).

18353516705 is an equidigital number, since it uses as much as digits as its factorization.

18353516705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670703346.

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 18353516705 in words is "eighteen billion, three hundred fifty-three million, five hundred sixteen thousand, seven hundred five".