18228223687 has 2 divisors, whose sum is σ = 18228223688. Its totient is φ = 18228223686.

The previous prime is 18228223681. The next prime is 18228223693. The reversal of 18228223687 is 78632282281.

It is a balanced prime because it is at equal distance from previous prime (18228223681) and next prime (18228223693).

It is a cyclic number.

It is not a de Polignac number, because 18228223687 - 2¹⁵ = 18228190919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18228223687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18228223681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114111843 + 9114111844.

It is an arithmetic number, because the mean of its divisors is an integer number (9114111844).

Almost surely, 2^18228223687 is an apocalyptic number.

18228223687 is a deficient number, since it is larger than the sum of its proper divisors (1).

18228223687 is an equidigital number, since it uses as much as digits as its factorization.

18228223687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1032192, while the sum is 49.

The spelling of 18228223687 in words is "eighteen billion, two hundred twenty-eight million, two hundred twenty-three thousand, six hundred eighty-seven".