66941549 has 2 divisors, whose sum is σ = 66941550. Its totient is φ = 66941548.

The previous prime is 66941531. The next prime is 66941551. The reversal of 66941549 is 94514966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61512649 + 5428900 = 7843^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 66941549 - 2²⁴ = 50164333 is a prime.

Together with 66941551, 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 (66341549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33470774 + 33470775.

It is an arithmetic number, because the mean of its divisors is an integer number (33470775).

Almost surely, 2^66941549 is an apocalyptic number.

It is an amenable number.

66941549 is a deficient number, since it is larger than the sum of its proper divisors (1).

66941549 is an equidigital number, since it uses as much as digits as its factorization.

66941549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 44.

The square root of 66941549 is about 8181.7815297159. The cubic root of 66941549 is about 406.0366654584.

The spelling of 66941549 in words is "sixty-six million, nine hundred forty-one thousand, five hundred forty-nine".