18661333 has 2 divisors, whose sum is σ = 18661334. Its totient is φ = 18661332.

The previous prime is 18661327. The next prime is 18661339. The reversal of 18661333 is 33316681.

It is a balanced prime because it is at equal distance from previous prime (18661327) and next prime (18661339).

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 743044 = 4233^2 + 862^2 .

It is a cyclic number.

It is not a de Polignac number, because 18661333 - 2⁹ = 18660821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18661295 and 18661304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18661339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9330666 + 9330667.

It is an arithmetic number, because the mean of its divisors is an integer number (9330667).

Almost surely, 2^18661333 is an apocalyptic number.

It is an amenable number.

18661333 is a deficient number, since it is larger than the sum of its proper divisors (1).

18661333 is an equidigital number, since it uses as much as digits as its factorization.

18661333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 18661333 is about 4319.8765028644. The cubic root of 18661333 is about 265.2452126854.

The spelling of 18661333 in words is "eighteen million, six hundred sixty-one thousand, three hundred thirty-three".