66766885 has 4 divisors (see below), whose sum is σ = 80120268. Its totient is φ = 53413504.

The previous prime is 66766883. The next prime is 66766891. The reversal of 66766885 is 58866766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18783556 + 47983329 = 4334^2 + 6927^2 .

It is a cyclic number.

It is not a de Polignac number, because 66766885 - 2¹ = 66766883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66766883) 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, 6676684 + ... + 6676693.

It is an arithmetic number, because the mean of its divisors is an integer number (20030067).

Almost surely, 2^66766885 is an apocalyptic number.

It is an amenable number.

66766885 is a deficient number, since it is larger than the sum of its proper divisors (13353383).

66766885 is a wasteful number, since it uses less digits than its factorization.

66766885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13353382.

The product of its digits is 2903040, while the sum is 52.

The square root of 66766885 is about 8171.1005990625. The cubic root of 66766885 is about 405.6832140257.

The spelling of 66766885 in words is "sixty-six million, seven hundred sixty-six thousand, eight hundred eighty-five".