66745453 has 2 divisors, whose sum is σ = 66745454. Its totient is φ = 66745452.

The previous prime is 66745429. The next prime is 66745457. The reversal of 66745453 is 35454766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52099524 + 14645929 = 7218^2 + 3827^2 .

It is a cyclic number.

It is not a de Polignac number, because 66745453 - 2²¹ = 64648301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66745457) 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, 33372726 + 33372727.

It is an arithmetic number, because the mean of its divisors is an integer number (33372727).

Almost surely, 2^66745453 is an apocalyptic number.

It is an amenable number.

66745453 is a deficient number, since it is larger than the sum of its proper divisors (1).

66745453 is an equidigital number, since it uses as much as digits as its factorization.

66745453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 40.

The square root of 66745453 is about 8169.7890425641. The cubic root of 66745453 is about 405.6398016208.

The spelling of 66745453 in words is "sixty-six million, seven hundred forty-five thousand, four hundred fifty-three".