66983549 has 2 divisors, whose sum is σ = 66983550. Its totient is φ = 66983548.

The previous prime is 66983537. The next prime is 66983557. The reversal of 66983549 is 94538966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51222649 + 15760900 = 7157^2 + 3970^2 .

It is a cyclic number.

It is not a de Polignac number, because 66983549 - 2²⁴ = 50206333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66983497 and 66983506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66982549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33491774 + 33491775.

It is an arithmetic number, because the mean of its divisors is an integer number (33491775).

Almost surely, 2^66983549 is an apocalyptic number.

It is an amenable number.

66983549 is a deficient number, since it is larger than the sum of its proper divisors (1).

66983549 is an equidigital number, since it uses as much as digits as its factorization.

66983549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 50.

The square root of 66983549 is about 8184.3478054149. The cubic root of 66983549 is about 406.1215652698.

The spelling of 66983549 in words is "sixty-six million, nine hundred eighty-three thousand, five hundred forty-nine".