66808810004 has 12 divisors (see below), whose sum is σ = 116918498004. Its totient is φ = 33403524864.

The previous prime is 66808809979. The next prime is 66808810007. The reversal of 66808810004 is 40001880866.

It can be written as a sum of positive squares in 2 ways, for example, as 46044576400 + 20764233604 = 214580^2 + 144098^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66808810007) 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 3 ways as a sum of consecutive naturals, for example, 31247 + ... + 366870.

It is an arithmetic number, because the mean of its divisors is an integer number (9743208167).

Almost surely, 2^66808810004 is an apocalyptic number.

It is an amenable number.

66808810004 is a deficient number, since it is larger than the sum of its proper divisors (50109688000).

66808810004 is a wasteful number, since it uses less digits than its factorization.

66808810004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440074 (or 440072 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The spelling of 66808810004 in words is "sixty-six billion, eight hundred eight million, eight hundred ten thousand, four".