66166073 has 2 divisors, whose sum is σ = 66166074. Its totient is φ = 66166072.

The previous prime is 66166069. The next prime is 66166103. The reversal of 66166073 is 37066166.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65739664 + 426409 = 8108^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 66166073 - 2² = 66166069 is a prime.

It is not a weakly prime, because it can be changed into another prime (66166033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33083036 + 33083037.

It is an arithmetic number, because the mean of its divisors is an integer number (33083037).

Almost surely, 2^66166073 is an apocalyptic number.

It is an amenable number.

66166073 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166073 is an equidigital number, since it uses as much as digits as its factorization.

66166073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 66166073 is about 8134.2530695817. The cubic root of 66166073 is about 404.4626781827.

The spelling of 66166073 in words is "sixty-six million, one hundred sixty-six thousand, seventy-three".