18285429905 has 4 divisors (see below), whose sum is σ = 21942515892. Its totient is φ = 14628343920.

The previous prime is 18285429871. The next prime is 18285429913. The reversal of 18285429905 is 50992458281.

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 12817862656 + 5467567249 = 113216^2 + 73943^2 .

It is not a de Polignac number, because 18285429905 - 2²² = 18281235601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828542986 + ... + 1828542995.

It is an arithmetic number, because the mean of its divisors is an integer number (5485628973).

Almost surely, 2^18285429905 is an apocalyptic number.

It is an amenable number.

18285429905 is a deficient number, since it is larger than the sum of its proper divisors (3657085987).

18285429905 is an equidigital number, since it uses as much as digits as its factorization.

18285429905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3657085986.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The spelling of 18285429905 in words is "eighteen billion, two hundred eighty-five million, four hundred twenty-nine thousand, nine hundred five".