6669401 has 2 divisors, whose sum is σ = 6669402. Its totient is φ = 6669400.

The previous prime is 6669367. The next prime is 6669409. The reversal of 6669401 is 1049666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6528025 + 141376 = 2555^2 + 376^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669401 - 2⁶ = 6669337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6669409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334700 + 3334701.

It is an arithmetic number, because the mean of its divisors is an integer number (3334701).

Almost surely, 2^6669401 is an apocalyptic number.

It is an amenable number.

6669401 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669401 is an equidigital number, since it uses as much as digits as its factorization.

6669401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6669401 is about 2582.5183445621. The cubic root of 6669401 is about 188.2329333210.

The spelling of 6669401 in words is "six million, six hundred sixty-nine thousand, four hundred one".