66760769 has 4 divisors (see below), whose sum is σ = 67510980. Its totient is φ = 66010560.

The previous prime is 66760753. The next prime is 66760777. The reversal of 66760769 is 96706766.

66760769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 32092225 + 34668544 = 5665^2 + 5888^2 .

It is a cyclic number.

It is not a de Polignac number, because 66760769 - 2⁴ = 66760753 is a prime.

It is a super-2 number, since 2×66760769² = 8914000554942722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66762769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374972 + ... + 375149.

It is an arithmetic number, because the mean of its divisors is an integer number (16877745).

Almost surely, 2^66760769 is an apocalyptic number.

It is an amenable number.

66760769 is a deficient number, since it is larger than the sum of its proper divisors (750211).

66760769 is an equidigital number, since it uses as much as digits as its factorization.

66760769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750210.

The product of its (nonzero) digits is 571536, while the sum is 47.

The square root of 66760769 is about 8170.7263447016. The cubic root of 66760769 is about 405.6708264761.

The spelling of 66760769 in words is "sixty-six million, seven hundred sixty thousand, seven hundred sixty-nine".