18255822987 has 4 divisors (see below), whose sum is σ = 24341097320. Its totient is φ = 12170548656.

The previous prime is 18255822983. The next prime is 18255823021. The reversal of 18255822987 is 78922855281.

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

It is not a de Polignac number, because 18255822987 - 2² = 18255822983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18255822983) 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, 3042637162 + ... + 3042637167.

It is an arithmetic number, because the mean of its divisors is an integer number (6085274330).

Almost surely, 2^18255822987 is an apocalyptic number.

18255822987 is a deficient number, since it is larger than the sum of its proper divisors (6085274333).

18255822987 is an equidigital number, since it uses as much as digits as its factorization.

18255822987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6085274332.

The product of its digits is 6451200, while the sum is 57.

The spelling of 18255822987 in words is "eighteen billion, two hundred fifty-five million, eight hundred twenty-two thousand, nine hundred eighty-seven".