18226538087 has 4 divisors (see below), whose sum is σ = 18227573616. Its totient is φ = 18225502560.

The previous prime is 18226538081. The next prime is 18226538093. The reversal of 18226538087 is 78083562281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78083562281 = 359 ⋅217502959.

It is an interprime number because it is at equal distance from previous prime (18226538081) and next prime (18226538093).

It is a cyclic number.

It is not a de Polignac number, because 18226538087 - 2⁸ = 18226537831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18226538081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490898 + ... + 526719.

It is an arithmetic number, because the mean of its divisors is an integer number (4556893404).

Almost surely, 2^18226538087 is an apocalyptic number.

18226538087 is a deficient number, since it is larger than the sum of its proper divisors (1035529).

18226538087 is a wasteful number, since it uses less digits than its factorization.

18226538087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035528.

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 18226538087 in words is "eighteen billion, two hundred twenty-six million, five hundred thirty-eight thousand, eighty-seven".