666195077 has 2 divisors, whose sum is σ = 666195078. Its totient is φ = 666195076.

The previous prime is 666195073. The next prime is 666195191. The reversal of 666195077 is 770591666.

It is a happy number.

666195077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 478340641 + 187854436 = 21871^2 + 13706^2 .

It is a cyclic number.

It is not a de Polignac number, because 666195077 - 2² = 666195073 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666195073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333097538 + 333097539.

It is an arithmetic number, because the mean of its divisors is an integer number (333097539).

Almost surely, 2^666195077 is an apocalyptic number.

It is an amenable number.

666195077 is a deficient number, since it is larger than the sum of its proper divisors (1).

666195077 is an equidigital number, since it uses as much as digits as its factorization.

666195077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476280, while the sum is 47.

The square root of 666195077 is about 25810.7550645075. The cubic root of 666195077 is about 873.3744303867.

The spelling of 666195077 in words is "six hundred sixty-six million, one hundred ninety-five thousand, seventy-seven".