66824646688808 has 16 divisors (see below), whose sum is σ = 131890750044000. Its totient is φ = 31653780010416.

The previous prime is 66824646688781. The next prime is 66824646688837. The reversal of 66824646688808 is 80888664642866.

It is a happy number.

It is a Smith number, since the sum of its digits (80) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219817916588 + ... + 219817916891.

It is an arithmetic number, because the mean of its divisors is an integer number (8243171877750).

Almost surely, 2^{66824646688808} is an apocalyptic number.

It is an amenable number.

66824646688808 is a deficient number, since it is larger than the sum of its proper divisors (65066103355192).

66824646688808 is a wasteful number, since it uses less digits than its factorization.

66824646688808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439635833504 (or 439635833500 counting only the distinct ones).

The product of its (nonzero) digits is 8153726976, while the sum is 80.

The spelling of 66824646688808 in words is "sixty-six trillion, eight hundred twenty-four billion, six hundred forty-six million, six hundred eighty-eight thousand, eight hundred eight".