66569445 has 80 divisors (see below), whose sum is σ = 129286080. Its totient is φ = 32659200.

The previous prime is 66569443. The next prime is 66569473. The reversal of 66569445 is 54496566.

It is not a de Polignac number, because 66569445 - 2¹ = 66569443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (777600) is a multiple of the sum of its prime factors (288).

It is a self number, because there is not a number n which added to its sum of digits gives 66569445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66569443) 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 in 79 ways as a sum of consecutive naturals, for example, 315390 + ... + 315600.

It is an arithmetic number, because the mean of its divisors is an integer number (1616076).

Almost surely, 2^66569445 is an apocalyptic number.

It is an amenable number.

66569445 is a deficient number, since it is larger than the sum of its proper divisors (62716635).

66569445 is a wasteful number, since it uses less digits than its factorization.

66569445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 279 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 66569445 is about 8159.0100502451. The cubic root of 66569445 is about 405.2829298734.

The spelling of 66569445 in words is "sixty-six million, five hundred sixty-nine thousand, four hundred forty-five".