66766447 has 8 divisors (see below), whose sum is σ = 76003200. Its totient is φ = 58057560.

The previous prime is 66766421. The next prime is 66766451. The reversal of 66766447 is 74466766.

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

It is not a de Polignac number, because 66766447 - 2⁷ = 66766319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66766397 and 66766406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66766477) 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, 131697 + ... + 132202.

It is an arithmetic number, because the mean of its divisors is an integer number (9500400).

Almost surely, 2^66766447 is an apocalyptic number.

66766447 is a deficient number, since it is larger than the sum of its proper divisors (9236753).

66766447 is a wasteful number, since it uses less digits than its factorization.

66766447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263933.

The product of its digits is 1016064, while the sum is 46.

The square root of 66766447 is about 8171.0737972435. The cubic root of 66766447 is about 405.6823269111.

The spelling of 66766447 in words is "sixty-six million, seven hundred sixty-six thousand, four hundred forty-seven".