66766313 has 4 divisors (see below), whose sum is σ = 67292160. Its totient is φ = 66240468.

The previous prime is 66766307. The next prime is 66766319. The reversal of 66766313 is 31366766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (66766307) and next prime (66766319).

It is a cyclic number.

It is not a de Polignac number, because 66766313 - 2¹⁸ = 66504169 is a prime.

It is a super-2 number, since 2×66766313² = 8915481103227938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66766319) 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, 262733 + ... + 262986.

It is an arithmetic number, because the mean of its divisors is an integer number (16823040).

Almost surely, 2^66766313 is an apocalyptic number.

It is an amenable number.

66766313 is a deficient number, since it is larger than the sum of its proper divisors (525847).

66766313 is a wasteful number, since it uses less digits than its factorization.

66766313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525846.

The product of its digits is 81648, while the sum is 38.

The square root of 66766313 is about 8171.0655975827. The cubic root of 66766313 is about 405.6820555099.

The spelling of 66766313 in words is "sixty-six million, seven hundred sixty-six thousand, three hundred thirteen".