66806025340 has 24 divisors (see below), whose sum is σ = 140434261632. Its totient is φ = 26695437120.

The previous prime is 66806025289. The next prime is 66806025379. The reversal of 66806025340 is 4352060866.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66806025293 and 66806025302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1665499 + ... + 1705138.

It is an arithmetic number, because the mean of its divisors is an integer number (5851427568).

Almost surely, 2^66806025340 is an apocalyptic number.

It is an amenable number.

66806025340 is an abundant number, since it is smaller than the sum of its proper divisors (73628236292).

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

66806025340 is a wasteful number, since it uses less digits than its factorization.

66806025340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371637 (or 3371635 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 66806025340 in words is "sixty-six billion, eight hundred six million, twenty-five thousand, three hundred forty".