18263868229 has 2 divisors, whose sum is σ = 18263868230. Its totient is φ = 18263868228.

The previous prime is 18263868193. The next prime is 18263868307. The reversal of 18263868229 is 92286836281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18196661025 + 67207204 = 134895^2 + 8198^2 .

It is a cyclic number.

It is not a de Polignac number, because 18263868229 - 2⁷ = 18263868101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18263868229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18263868929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9131934114 + 9131934115.

It is an arithmetic number, because the mean of its divisors is an integer number (9131934115).

Almost surely, 2^18263868229 is an apocalyptic number.

It is an amenable number.

18263868229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18263868229 is an equidigital number, since it uses as much as digits as its factorization.

18263868229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3981312, while the sum is 55.

The spelling of 18263868229 in words is "eighteen billion, two hundred sixty-three million, eight hundred sixty-eight thousand, two hundred twenty-nine".