6662646161 has 2 divisors, whose sum is σ = 6662646162. Its totient is φ = 6662646160.

The previous prime is 6662646149. The next prime is 6662646167. The reversal of 6662646161 is 1616462666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3588609025 + 3074037136 = 59905^2 + 55444^2 .

It is a cyclic number.

It is not a de Polignac number, because 6662646161 - 2¹⁰ = 6662645137 is a prime.

It is not a weakly prime, because it can be changed into another prime (6662646167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331323080 + 3331323081.

It is an arithmetic number, because the mean of its divisors is an integer number (3331323081).

Almost surely, 2^6662646161 is an apocalyptic number.

It is an amenable number.

6662646161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6662646161 is an equidigital number, since it uses as much as digits as its factorization.

6662646161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 44.

The square root of 6662646161 is about 81625.0339111721. The cubic root of 6662646161 is about 1881.6936376112.

The spelling of 6662646161 in words is "six billion, six hundred sixty-two million, six hundred forty-six thousand, one hundred sixty-one".