66233549 has 2 divisors, whose sum is σ = 66233550. Its totient is φ = 66233548.

The previous prime is 66233509. The next prime is 66233551. The reversal of 66233549 is 94533266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63282025 + 2951524 = 7955^2 + 1718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66233549 is a prime.

Together with 66233551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66233509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33116774 + 33116775.

It is an arithmetic number, because the mean of its divisors is an integer number (33116775).

Almost surely, 2^66233549 is an apocalyptic number.

It is an amenable number.

66233549 is a deficient number, since it is larger than the sum of its proper divisors (1).

66233549 is an equidigital number, since it uses as much as digits as its factorization.

66233549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 38.

The square root of 66233549 is about 8138.3996584095. The cubic root of 66233549 is about 404.6001214896.

The spelling of 66233549 in words is "sixty-six million, two hundred thirty-three thousand, five hundred forty-nine".