18343312277 has 2 divisors, whose sum is σ = 18343312278. Its totient is φ = 18343312276.

The previous prime is 18343312259. The next prime is 18343312303. The reversal of 18343312277 is 77221334381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10724466481 + 7618845796 = 103559^2 + 87286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18343312277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18343312217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9171656138 + 9171656139.

It is an arithmetic number, because the mean of its divisors is an integer number (9171656139).

Almost surely, 2^18343312277 is an apocalyptic number.

It is an amenable number.

18343312277 is a deficient number, since it is larger than the sum of its proper divisors (1).

18343312277 is an equidigital number, since it uses as much as digits as its factorization.

18343312277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 41.

The spelling of 18343312277 in words is "eighteen billion, three hundred forty-three million, three hundred twelve thousand, two hundred seventy-seven".