66789673 has 2 divisors, whose sum is σ = 66789674. Its totient is φ = 66789672.

The previous prime is 66789661. The next prime is 66789691. The reversal of 66789673 is 37698766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46826649 + 19963024 = 6843^2 + 4468^2 .

It is a cyclic number.

It is not a de Polignac number, because 66789673 - 2¹⁷ = 66658601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66789673.

It is not a weakly prime, because it can be changed into another prime (66789473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33394836 + 33394837.

It is an arithmetic number, because the mean of its divisors is an integer number (33394837).

Almost surely, 2^66789673 is an apocalyptic number.

It is an amenable number.

66789673 is a deficient number, since it is larger than the sum of its proper divisors (1).

66789673 is an equidigital number, since it uses as much as digits as its factorization.

66789673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 52.

The square root of 66789673 is about 8172.4949066977. The cubic root of 66789673 is about 405.7293629388.

The spelling of 66789673 in words is "sixty-six million, seven hundred eighty-nine thousand, six hundred seventy-three".