66111673 has 2 divisors, whose sum is σ = 66111674. Its totient is φ = 66111672.

The previous prime is 66111631. The next prime is 66111709. The reversal of 66111673 is 37611166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53173264 + 12938409 = 7292^2 + 3597^2 .

It is a cyclic number.

It is not a de Polignac number, because 66111673 - 2¹³ = 66103481 is a prime.

It is not a weakly prime, because it can be changed into another prime (66111173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33055836 + 33055837.

It is an arithmetic number, because the mean of its divisors is an integer number (33055837).

Almost surely, 2^66111673 is an apocalyptic number.

It is an amenable number.

66111673 is a deficient number, since it is larger than the sum of its proper divisors (1).

66111673 is an equidigital number, since it uses as much as digits as its factorization.

66111673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 66111673 is about 8130.9084978248. The cubic root of 66111673 is about 404.3518016086.

The spelling of 66111673 in words is "sixty-six million, one hundred eleven thousand, six hundred seventy-three".