18666733 has 2 divisors, whose sum is σ = 18666734. Its totient is φ = 18666732.

The previous prime is 18666709. The next prime is 18666761. The reversal of 18666733 is 33766681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18645124 + 21609 = 4318^2 + 147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18666733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18666763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9333366 + 9333367.

It is an arithmetic number, because the mean of its divisors is an integer number (9333367).

Almost surely, 2^18666733 is an apocalyptic number.

It is an amenable number.

18666733 is a deficient number, since it is larger than the sum of its proper divisors (1).

18666733 is an equidigital number, since it uses as much as digits as its factorization.

18666733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 18666733 is about 4320.5014755234. The cubic root of 18666733 is about 265.2707947453.

The spelling of 18666733 in words is "eighteen million, six hundred sixty-six thousand, seven hundred thirty-three".