66366745 has 4 divisors (see below), whose sum is σ = 79640100. Its totient is φ = 53093392.

The previous prime is 66366737. The next prime is 66366749. The reversal of 66366745 is 54766366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54766366 = 2 ⋅27383183.

It can be written as a sum of positive squares in 2 ways, for example, as 33223696 + 33143049 = 5764^2 + 5757^2 .

It is a cyclic number.

It is not a de Polignac number, because 66366745 - 2³ = 66366737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66366749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6636670 + ... + 6636679.

It is an arithmetic number, because the mean of its divisors is an integer number (19910025).

Almost surely, 2^66366745 is an apocalyptic number.

It is an amenable number.

66366745 is a deficient number, since it is larger than the sum of its proper divisors (13273355).

66366745 is a wasteful number, since it uses less digits than its factorization.

66366745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13273354.

The product of its digits is 544320, while the sum is 43.

The square root of 66366745 is about 8146.5787297491. The cubic root of 66366745 is about 404.8711575119.

The spelling of 66366745 in words is "sixty-six million, three hundred sixty-six thousand, seven hundred forty-five".