66404745 has 64 divisors (see below), whose sum is σ = 130394880. Its totient is φ = 31795200.

The previous prime is 66404743. The next prime is 66404747. The reversal of 66404745 is 54740466.

66404745 is a `hidden beast` number, since 6 + 640 + 4 + 7 + 4 + 5 = 666.

66404745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66404743) and next prime (66404747).

It is not a de Polignac number, because 66404745 - 2¹ = 66404743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66404743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 143815 + ... + 144275.

It is an arithmetic number, because the mean of its divisors is an integer number (2037420).

Almost surely, 2^66404745 is an apocalyptic number.

It is an amenable number.

66404745 is a deficient number, since it is larger than the sum of its proper divisors (63990135).

66404745 is a wasteful number, since it uses less digits than its factorization.

66404745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 66404745 is about 8148.9106633954. The cubic root of 66404745 is about 404.9484159267.

The spelling of 66404745 in words is "sixty-six million, four hundred four thousand, seven hundred forty-five".