66745033 has 2 divisors, whose sum is σ = 66745034. Its totient is φ = 66745032.

The previous prime is 66744973. The next prime is 66745069. The reversal of 66745033 is 33054766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51667344 + 15077689 = 7188^2 + 3883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66745033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66745033.

It is not a weakly prime, because it can be changed into another prime (66745093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33372516 + 33372517.

It is an arithmetic number, because the mean of its divisors is an integer number (33372517).

Almost surely, 2^66745033 is an apocalyptic number.

It is an amenable number.

66745033 is a deficient number, since it is larger than the sum of its proper divisors (1).

66745033 is an equidigital number, since it uses as much as digits as its factorization.

66745033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 34.

The square root of 66745033 is about 8169.7633380656. The cubic root of 66745033 is about 405.6389507810.

Adding to 66745033 its reverse (33054766), we get a palindrome (99799799).

The spelling of 66745033 in words is "sixty-six million, seven hundred forty-five thousand, thirty-three".