18836122087 has 4 divisors (see below), whose sum is σ = 18876981816. Its totient is φ = 18795262360.

The previous prime is 18836122057. The next prime is 18836122091. The reversal of 18836122087 is 78022163881.

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

It is a cyclic number.

It is not a de Polignac number, because 18836122087 - 2⁷ = 18836121959 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 (18836122027) 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, 20429173 + ... + 20430094.

It is an arithmetic number, because the mean of its divisors is an integer number (4719245454).

Almost surely, 2^18836122087 is an apocalyptic number.

18836122087 is a deficient number, since it is larger than the sum of its proper divisors (40859729).

18836122087 is an equidigital number, since it uses as much as digits as its factorization.

18836122087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40859728.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 18836122087 in words is "eighteen billion, eight hundred thirty-six million, one hundred twenty-two thousand, eighty-seven".