66660773 has 2 divisors, whose sum is σ = 66660774. Its totient is φ = 66660772.

The previous prime is 66660761. The next prime is 66660799. The reversal of 66660773 is 37706666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65966884 + 693889 = 8122^2 + 833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66660773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66660773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66669773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33330386 + 33330387.

It is an arithmetic number, because the mean of its divisors is an integer number (33330387).

Almost surely, 2^66660773 is an apocalyptic number.

It is an amenable number.

66660773 is a deficient number, since it is larger than the sum of its proper divisors (1).

66660773 is an equidigital number, since it uses as much as digits as its factorization.

66660773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 41.

The square root of 66660773 is about 8164.6048893991. The cubic root of 66660773 is about 405.4681838624.

The spelling of 66660773 in words is "sixty-six million, six hundred sixty thousand, seven hundred seventy-three".