18132661 has 2 divisors, whose sum is σ = 18132662. Its totient is φ = 18132660.

The previous prime is 18132643. The next prime is 18132683. The reversal of 18132661 is 16623181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17690436 + 442225 = 4206^2 + 665^2 .

It is a cyclic number.

It is not a de Polignac number, because 18132661 - 2⁵ = 18132629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18138661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9066330 + 9066331.

It is an arithmetic number, because the mean of its divisors is an integer number (9066331).

Almost surely, 2^18132661 is an apocalyptic number.

It is an amenable number.

18132661 is a deficient number, since it is larger than the sum of its proper divisors (1).

18132661 is an equidigital number, since it uses as much as digits as its factorization.

18132661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 18132661 is about 4258.2462352476. The cubic root of 18132661 is about 262.7163978246.

It can be divided in two parts, 181 and 32661, that multiplied together give a triangular number (5911641 = T₃₄₃₈).

The spelling of 18132661 in words is "eighteen million, one hundred thirty-two thousand, six hundred sixty-one".