66409845 has 32 divisors (see below), whose sum is σ = 114470400. Its totient is φ = 32768064.

The previous prime is 66409841. The next prime is 66409853. The reversal of 66409845 is 54890466.

It is not a de Polignac number, because 66409845 - 2² = 66409841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66409797 and 66409806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66409841) 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 31 ways as a sum of consecutive naturals, for example, 9546 + ... + 14964.

It is an arithmetic number, because the mean of its divisors is an integer number (3577200).

Almost surely, 2^66409845 is an apocalyptic number.

It is an amenable number.

66409845 is a deficient number, since it is larger than the sum of its proper divisors (48060555).

66409845 is a wasteful number, since it uses less digits than its factorization.

66409845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5489.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 66409845 is about 8149.2235826488. The cubic root of 66409845 is about 404.9587825757.

The spelling of 66409845 in words is "sixty-six million, four hundred nine thousand, eight hundred forty-five".