666141061 has 2 divisors, whose sum is σ = 666141062. Its totient is φ = 666141060.

The previous prime is 666141053. The next prime is 666141089. The reversal of 666141061 is 160141666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630512100 + 35628961 = 25110^2 + 5969^2 .

It is a cyclic number.

It is not a de Polignac number, because 666141061 - 2³ = 666141053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666141031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333070530 + 333070531.

It is an arithmetic number, because the mean of its divisors is an integer number (333070531).

Almost surely, 2^666141061 is an apocalyptic number.

It is an amenable number.

666141061 is a deficient number, since it is larger than the sum of its proper divisors (1).

666141061 is an equidigital number, since it uses as much as digits as its factorization.

666141061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 666141061 is about 25809.7086577900. The cubic root of 666141061 is about 873.3508249545.

The spelling of 666141061 in words is "six hundred sixty-six million, one hundred forty-one thousand, sixty-one".