666195377 has 2 divisors, whose sum is σ = 666195378. Its totient is φ = 666195376.

The previous prime is 666195359. The next prime is 666195401. The reversal of 666195377 is 773591666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644702881 + 21492496 = 25391^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 666195377 - 2¹⁴ = 666178993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666195317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333097688 + 333097689.

It is an arithmetic number, because the mean of its divisors is an integer number (333097689).

Almost surely, 2^666195377 is an apocalyptic number.

It is an amenable number.

666195377 is a deficient number, since it is larger than the sum of its proper divisors (1).

666195377 is an equidigital number, since it uses as much as digits as its factorization.

666195377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 50.

The square root of 666195377 is about 25810.7608760377. The cubic root of 666195377 is about 873.3745614856.

The spelling of 666195377 in words is "six hundred sixty-six million, one hundred ninety-five thousand, three hundred seventy-seven".