666710101 has 2 divisors, whose sum is σ = 666710102. Its totient is φ = 666710100.

The previous prime is 666710081. The next prime is 666710111. The reversal of 666710101 is 101017666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 497736100 + 168974001 = 22310^2 + 12999^2 .

It is a cyclic number.

It is not a de Polignac number, because 666710101 - 2⁷ = 666709973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666710101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666710111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333355050 + 333355051.

It is an arithmetic number, because the mean of its divisors is an integer number (333355051).

Almost surely, 2^666710101 is an apocalyptic number.

It is an amenable number.

666710101 is a deficient number, since it is larger than the sum of its proper divisors (1).

666710101 is an equidigital number, since it uses as much as digits as its factorization.

666710101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 666710101 is about 25820.7300632651. The cubic root of 666710101 is about 873.5994360169.

Adding to 666710101 its reverse (101017666), we get a palindrome (767727767).

The spelling of 666710101 in words is "six hundred sixty-six million, seven hundred ten thousand, one hundred one".