66782533 has 2 divisors, whose sum is σ = 66782534. Its totient is φ = 66782532.

The previous prime is 66782509. The next prime is 66782537. The reversal of 66782533 is 33528766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58476609 + 8305924 = 7647^2 + 2882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66782533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66782537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33391266 + 33391267.

It is an arithmetic number, because the mean of its divisors is an integer number (33391267).

Almost surely, 2^66782533 is an apocalyptic number.

It is an amenable number.

66782533 is a deficient number, since it is larger than the sum of its proper divisors (1).

66782533 is an equidigital number, since it uses as much as digits as its factorization.

66782533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The square root of 66782533 is about 8172.0580639151. The cubic root of 66782533 is about 405.7149045614.

The spelling of 66782533 in words is "sixty-six million, seven hundred eighty-two thousand, five hundred thirty-three".