66845078 has 16 divisors (see below), whose sum is σ = 106995120. Its totient is φ = 31228416.

The previous prime is 66845063. The next prime is 66845089. The reversal of 66845078 is 87054866.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9275 + ... + 14822.

It is an arithmetic number, because the mean of its divisors is an integer number (6687195).

Almost surely, 2^66845078 is an apocalyptic number.

66845078 is a deficient number, since it is larger than the sum of its proper divisors (40150042).

66845078 is a wasteful number, since it uses less digits than its factorization.

66845078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24191.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 66845078 is about 8175.8839277475. The cubic root of 66845078 is about 405.8415221060.

The spelling of 66845078 in words is "sixty-six million, eight hundred forty-five thousand, seventy-eight".