18051984633985 has 4 divisors (see below), whose sum is σ = 21662381560788. Its totient is φ = 14441587707184.

The previous prime is 18051984633971. The next prime is 18051984634087. The reversal of 18051984633985 is 58933648915081.

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 2132554946929 + 15919429687056 = 1460327^2 + 3989916^2 .

It is a cyclic number.

It is not a de Polignac number, because 18051984633985 - 2⁷ = 18051984633857 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, 1805198463394 + ... + 1805198463403.

It is an arithmetic number, because the mean of its divisors is an integer number (5415595390197).

Almost surely, 2^{18051984633985} is an apocalyptic number.

It is an amenable number.

18051984633985 is a deficient number, since it is larger than the sum of its proper divisors (3610396926803).

18051984633985 is an equidigital number, since it uses as much as digits as its factorization.

18051984633985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610396926802.

The product of its (nonzero) digits is 223948800, while the sum is 70.

The spelling of 18051984633985 in words is "eighteen trillion, fifty-one billion, nine hundred eighty-four million, six hundred thirty-three thousand, nine hundred eighty-five".