6660161 has 2 divisors, whose sum is σ = 6660162. Its totient is φ = 6660160.

The previous prime is 6660119. The next prime is 6660191. The reversal of 6660161 is 1610666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4000000 + 2660161 = 2000^2 + 1631^2 .

It is a cyclic number.

It is not a de Polignac number, because 6660161 - 2¹⁸ = 6398017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6660161.

It is not a weakly prime, because it can be changed into another prime (6660191) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330080 + 3330081.

It is an arithmetic number, because the mean of its divisors is an integer number (3330081).

Almost surely, 2^6660161 is an apocalyptic number.

It is an amenable number.

6660161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660161 is an equidigital number, since it uses as much as digits as its factorization.

6660161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 6660161 is about 2580.7287730407. The cubic root of 6660161 is about 188.1459651841.

The spelling of 6660161 in words is "six million, six hundred sixty thousand, one hundred sixty-one".