66572773 has 2 divisors, whose sum is σ = 66572774. Its totient is φ = 66572772.

The previous prime is 66572771. The next prime is 66572783. The reversal of 66572773 is 37727566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58721569 + 7851204 = 7663^2 + 2802^2 .

It is a cyclic number.

It is not a de Polignac number, because 66572773 - 2¹ = 66572771 is a prime.

Together with 66572771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66572771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286386 + 33286387.

It is an arithmetic number, because the mean of its divisors is an integer number (33286387).

Almost surely, 2^66572773 is an apocalyptic number.

It is an amenable number.

66572773 is a deficient number, since it is larger than the sum of its proper divisors (1).

66572773 is an equidigital number, since it uses as much as digits as its factorization.

66572773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 370440, while the sum is 43.

The square root of 66572773 is about 8159.2139940070. The cubic root of 66572773 is about 405.2896835179.

The spelling of 66572773 in words is "sixty-six million, five hundred seventy-two thousand, seven hundred seventy-three".