66803445 has 24 divisors (see below), whose sum is σ = 116040600. Its totient is φ = 35552256.

The previous prime is 66803437. The next prime is 66803447. The reversal of 66803445 is 54430866.

It can be written as a sum of positive squares in 4 ways, for example, as 1096209 + 65707236 = 1047^2 + 8106^2 .

It is not a de Polignac number, because 66803445 - 2³ = 66803437 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66803447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24301 + ... + 26909.

It is an arithmetic number, because the mean of its divisors is an integer number (4835025).

Almost surely, 2^66803445 is an apocalyptic number.

It is an amenable number.

66803445 is a deficient number, since it is larger than the sum of its proper divisors (49237155).

66803445 is a wasteful number, since it uses less digits than its factorization.

66803445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3189 (or 3186 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 66803445 is about 8173.3374456216. The cubic root of 66803445 is about 405.7572480919.

The spelling of 66803445 in words is "sixty-six million, eight hundred three thousand, four hundred forty-five".