666195073 has 2 divisors, whose sum is σ = 666195074. Its totient is φ = 666195072.

The previous prime is 666195067. The next prime is 666195077. The reversal of 666195073 is 370591666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643992129 + 22202944 = 25377^2 + 4712^2 .

It is a cyclic number.

It is not a de Polignac number, because 666195073 - 2⁹ = 666194561 is a prime.

It is not a weakly prime, because it can be changed into another prime (666195077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333097536 + 333097537.

It is an arithmetic number, because the mean of its divisors is an integer number (333097537).

Almost surely, 2^666195073 is an apocalyptic number.

It is an amenable number.

666195073 is a deficient number, since it is larger than the sum of its proper divisors (1).

666195073 is an equidigital number, since it uses as much as digits as its factorization.

666195073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 666195073 is about 25810.7549870204. The cubic root of 666195073 is about 873.3744286388.

The spelling of 666195073 in words is "six hundred sixty-six million, one hundred ninety-five thousand, seventy-three".