666670577 has 2 divisors, whose sum is σ = 666670578. Its totient is φ = 666670576.

The previous prime is 666670553. The next prime is 666670579. The reversal of 666670577 is 775076666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 656179456 + 10491121 = 25616^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 666670577 - 2¹⁸ = 666408433 is a prime.

Together with 666670579, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666670579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333335288 + 333335289.

It is an arithmetic number, because the mean of its divisors is an integer number (333335289).

Almost surely, 2^666670577 is an apocalyptic number.

It is an amenable number.

666670577 is a deficient number, since it is larger than the sum of its proper divisors (1).

666670577 is an equidigital number, since it uses as much as digits as its factorization.

666670577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2222640, while the sum is 50.

The square root of 666670577 is about 25819.9646978845. The cubic root of 666670577 is about 873.5821727284.

The spelling of 666670577 in words is "six hundred sixty-six million, six hundred seventy thousand, five hundred seventy-seven".