66677766 has 8 divisors (see below), whose sum is σ = 133355544. Its totient is φ = 22225920.

The previous prime is 66677761. The next prime is 66677773. The reversal of 66677766 is 66777666.

It is a sphenic number, since it is the product of 3 distinct primes.

66677766 is an admirable number.

It is a Curzon number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5556475 + ... + 5556486.

It is an arithmetic number, because the mean of its divisors is an integer number (16669443).

Almost surely, 2^66677766 is an apocalyptic number.

66677766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66677766 is a wasteful number, since it uses less digits than its factorization.

66677766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11112966.

The product of its digits is 2667168, while the sum is 51.

The square root of 66677766 is about 8165.6454735679. The cubic root of 66677766 is about 405.5026345853.

The spelling of 66677766 in words is "sixty-six million, six hundred seventy-seven thousand, seven hundred sixty-six".