18685033349 has 2 divisors, whose sum is σ = 18685033350. Its totient is φ = 18685033348.

The previous prime is 18685033313. The next prime is 18685033397. The reversal of 18685033349 is 94333058681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16895320324 + 1789713025 = 129982^2 + 42305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18685033349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18685033297 and 18685033306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18685033649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342516674 + 9342516675.

It is an arithmetic number, because the mean of its divisors is an integer number (9342516675).

Almost surely, 2^18685033349 is an apocalyptic number.

It is an amenable number.

18685033349 is a deficient number, since it is larger than the sum of its proper divisors (1).

18685033349 is an equidigital number, since it uses as much as digits as its factorization.

18685033349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 18685033349 in words is "eighteen billion, six hundred eighty-five million, thirty-three thousand, three hundred forty-nine".