6669161 has 2 divisors, whose sum is σ = 6669162. Its totient is φ = 6669160.

The previous prime is 6669137. The next prime is 6669163. The reversal of 6669161 is 1619666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5669161 + 1000000 = 2381^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669161 - 2⁶ = 6669097 is a prime.

Together with 6669163, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6669163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334580 + 3334581.

It is an arithmetic number, because the mean of its divisors is an integer number (3334581).

Almost surely, 2^6669161 is an apocalyptic number.

It is an amenable number.

6669161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669161 is an equidigital number, since it uses as much as digits as its factorization.

6669161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 35.

The square root of 6669161 is about 2582.4718778721. The cubic root of 6669161 is about 188.2306754247.

The spelling of 6669161 in words is "six million, six hundred sixty-nine thousand, one hundred sixty-one".