66788806610 has 16 divisors (see below), whose sum is σ = 127291608216. Its totient is φ = 25144021248.

The previous prime is 66788806571. The next prime is 66788806619. The reversal of 66788806610 is 1660888766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 65356411201 + 1432395409 = 255649^2 + 37847^2 .

It is not an unprimeable number, because it can be changed into a prime (66788806619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196437497 + ... + 196437836.

Almost surely, 2^66788806610 is an apocalyptic number.

66788806610 is a deficient number, since it is larger than the sum of its proper divisors (60502801606).

66788806610 is a wasteful number, since it uses less digits than its factorization.

66788806610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392875357.

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 66788806610 in words is "sixty-six billion, seven hundred eighty-eight million, eight hundred six thousand, six hundred ten".