66773789 has 8 divisors (see below), whose sum is σ = 70252728. Its totient is φ = 63383040.

The previous prime is 66773779. The next prime is 66773801. The reversal of 66773789 is 98737766.

It can be written as a sum of positive squares in 4 ways, for example, as 15077689 + 51696100 = 3883^2 + 7190^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66773789 - 2⁸ = 66773533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66773789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66773719) 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 7 ways as a sum of consecutive naturals, for example, 20492 + ... + 23525.

It is an arithmetic number, because the mean of its divisors is an integer number (8781591).

Almost surely, 2^66773789 is an apocalyptic number.

It is an amenable number.

66773789 is a deficient number, since it is larger than the sum of its proper divisors (3478939).

66773789 is a wasteful number, since it uses less digits than its factorization.

66773789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44095.

The product of its digits is 2667168, while the sum is 53.

The square root of 66773789 is about 8171.5230526506. The cubic root of 66773789 is about 405.6971967077.

The spelling of 66773789 in words is "sixty-six million, seven hundred seventy-three thousand, seven hundred eighty-nine".