66845995604 has 12 divisors (see below), whose sum is σ = 117033512064. Its totient is φ = 33407849304.

The previous prime is 66845995571. The next prime is 66845995621. The reversal of 66845995604 is 40659954866.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3777194 + ... + 3794849.

It is an arithmetic number, because the mean of its divisors is an integer number (9752792672).

Almost surely, 2^66845995604 is an apocalyptic number.

It is an amenable number.

66845995604 is a deficient number, since it is larger than the sum of its proper divisors (50187516460).

66845995604 is a wasteful number, since it uses less digits than its factorization.

66845995604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7574254 (or 7574252 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 62.

The spelling of 66845995604 in words is "sixty-six billion, eight hundred forty-five million, nine hundred ninety-five thousand, six hundred four".