666089101 has 2 divisors, whose sum is σ = 666089102. Its totient is φ = 666089100.

The previous prime is 666089093. The next prime is 666089119. The reversal of 666089101 is 101980666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525097225 + 140991876 = 22915^2 + 11874^2 .

It is a cyclic number.

It is not a de Polignac number, because 666089101 - 2³ = 666089093 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 (666089141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333044550 + 333044551.

It is an arithmetic number, because the mean of its divisors is an integer number (333044551).

Almost surely, 2^666089101 is an apocalyptic number.

It is an amenable number.

666089101 is a deficient number, since it is larger than the sum of its proper divisors (1).

666089101 is an equidigital number, since it uses as much as digits as its factorization.

666089101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 666089101 is about 25808.7020402034. The cubic root of 666089101 is about 873.3281168068.

The spelling of 666089101 in words is "six hundred sixty-six million, eighty-nine thousand, one hundred one".