18452861785 has 4 divisors (see below), whose sum is σ = 22143434148. Its totient is φ = 14762289424.

The previous prime is 18452861773. The next prime is 18452861789. The reversal of 18452861785 is 58716825481.

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 11191947264 + 7260914521 = 105792^2 + 85211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18452861785 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18452861789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1845286174 + ... + 1845286183.

It is an arithmetic number, because the mean of its divisors is an integer number (5535858537).

Almost surely, 2^18452861785 is an apocalyptic number.

It is an amenable number.

18452861785 is a deficient number, since it is larger than the sum of its proper divisors (3690572363).

18452861785 is an equidigital number, since it uses as much as digits as its factorization.

18452861785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690572362.

The product of its digits is 4300800, while the sum is 55.

The spelling of 18452861785 in words is "eighteen billion, four hundred fifty-two million, eight hundred sixty-one thousand, seven hundred eighty-five".