66834541 has 2 divisors, whose sum is σ = 66834542. Its totient is φ = 66834540.

The previous prime is 66834539. The next prime is 66834557. The reversal of 66834541 is 14543866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41332041 + 25502500 = 6429^2 + 5050^2 .

It is a cyclic number.

It is not a de Polignac number, because 66834541 - 2¹ = 66834539 is a prime.

Together with 66834539, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66834541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66835541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33417270 + 33417271.

It is an arithmetic number, because the mean of its divisors is an integer number (33417271).

Almost surely, 2^66834541 is an apocalyptic number.

It is an amenable number.

66834541 is a deficient number, since it is larger than the sum of its proper divisors (1).

66834541 is an equidigital number, since it uses as much as digits as its factorization.

66834541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 37.

The square root of 66834541 is about 8175.2395071949. The cubic root of 66834541 is about 405.8201962934.

The spelling of 66834541 in words is "sixty-six million, eight hundred thirty-four thousand, five hundred forty-one".