66807554680 has 16 divisors (see below), whose sum is σ = 150316998120. Its totient is φ = 26723021856.

The previous prime is 66807554663. The next prime is 66807554689. The reversal of 66807554680 is 8645570866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66807554689) 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, 835094394 + ... + 835094473.

Almost surely, 2^66807554680 is an apocalyptic number.

It is an amenable number.

66807554680 is an abundant number, since it is smaller than the sum of its proper divisors (83509443440).

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

66807554680 is a wasteful number, since it uses less digits than its factorization.

66807554680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670188878 (or 1670188874 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 66807554680 in words is "sixty-six billion, eight hundred seven million, five hundred fifty-four thousand, six hundred eighty".