66302545 has 4 divisors (see below), whose sum is σ = 79563060. Its totient is φ = 53042032.

The previous prime is 66302539. The next prime is 66302611. The reversal of 66302545 is 54520366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12588304 + 53714241 = 3548^2 + 7329^2 .

It is a cyclic number.

It is not a de Polignac number, because 66302545 - 2¹¹ = 66300497 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6630250 + ... + 6630259.

It is an arithmetic number, because the mean of its divisors is an integer number (19890765).

Almost surely, 2^66302545 is an apocalyptic number.

It is an amenable number.

66302545 is a deficient number, since it is larger than the sum of its proper divisors (13260515).

66302545 is a wasteful number, since it uses less digits than its factorization.

66302545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13260514.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 66302545 is about 8142.6374719743. The cubic root of 66302545 is about 404.7405644255.

The spelling of 66302545 in words is "sixty-six million, three hundred two thousand, five hundred forty-five".