66830549 has 2 divisors, whose sum is σ = 66830550. Its totient is φ = 66830548.

The previous prime is 66830527. The next prime is 66830591. The reversal of 66830549 is 94503866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59567524 + 7263025 = 7718^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 66830549 - 2⁸ = 66830293 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 (66830149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33415274 + 33415275.

It is an arithmetic number, because the mean of its divisors is an integer number (33415275).

Almost surely, 2^66830549 is an apocalyptic number.

It is an amenable number.

66830549 is a deficient number, since it is larger than the sum of its proper divisors (1).

66830549 is an equidigital number, since it uses as much as digits as its factorization.

66830549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 66830549 is about 8174.9953516806. The cubic root of 66830549 is about 405.8121163073.

The spelling of 66830549 in words is "sixty-six million, eight hundred thirty thousand, five hundred forty-nine".