669143441 has 2 divisors, whose sum is σ = 669143442. Its totient is φ = 669143440.

The previous prime is 669143437. The next prime is 669143491. The reversal of 669143441 is 144341966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434931025 + 234212416 = 20855^2 + 15304^2 .

It is a cyclic number.

It is not a de Polignac number, because 669143441 - 2² = 669143437 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 669143395 and 669143404.

It is not a weakly prime, because it can be changed into another prime (669143491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334571720 + 334571721.

It is an arithmetic number, because the mean of its divisors is an integer number (334571721).

Almost surely, 2^669143441 is an apocalyptic number.

It is an amenable number.

669143441 is a deficient number, since it is larger than the sum of its proper divisors (1).

669143441 is an equidigital number, since it uses as much as digits as its factorization.

669143441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 669143441 is about 25867.8070388659. The cubic root of 669143441 is about 874.6609586058.

The spelling of 669143441 in words is "six hundred sixty-nine million, one hundred forty-three thousand, four hundred forty-one".