18087728719 has 2 divisors, whose sum is σ = 18087728720. Its totient is φ = 18087728718.

The previous prime is 18087728717. The next prime is 18087728749. The reversal of 18087728719 is 91782778081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18087728719 - 2¹ = 18087728717 is a prime.

It is a super-2 number, since 2×18087728719² (a number of 21 digits) contains 22 as substring.

Together with 18087728717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18087728713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9043864359 + 9043864360.

It is an arithmetic number, because the mean of its divisors is an integer number (9043864360).

Almost surely, 2^18087728719 is an apocalyptic number.

18087728719 is a deficient number, since it is larger than the sum of its proper divisors (1).

18087728719 is an equidigital number, since it uses as much as digits as its factorization.

18087728719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3161088, while the sum is 58.

The spelling of 18087728719 in words is "eighteen billion, eighty-seven million, seven hundred twenty-eight thousand, seven hundred nineteen".