66808555524 has 72 divisors (see below), whose sum is σ = 173054182392. Its totient is φ = 21719070720.

The previous prime is 66808555507. The next prime is 66808555529. The reversal of 66808555524 is 42555580866.

It is a happy number.

66808555524 is a `hidden beast` number, since 6 + 6 + 8 + 0 + 85 + 5 + 552 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13931553024 + 52877002500 = 118032^2 + 229950^2 .

It is not an unprimeable number, because it can be changed into a prime (66808555529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6006192 + ... + 6017304.

It is an arithmetic number, because the mean of its divisors is an integer number (2403530311).

Almost surely, 2^66808555524 is an apocalyptic number.

It is an amenable number.

66808555524 is an abundant number, since it is smaller than the sum of its proper divisors (106245626868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66808555524 is a wasteful number, since it uses less digits than its factorization.

66808555524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15237 (or 15232 counting only the distinct ones).

The product of its (nonzero) digits is 11520000, while the sum is 54.

The spelling of 66808555524 in words is "sixty-six billion, eight hundred eight million, five hundred fifty-five thousand, five hundred twenty-four".