669571543 has 2 divisors, whose sum is σ = 669571544. Its totient is φ = 669571542.

The previous prime is 669571481. The next prime is 669571603. The reversal of 669571543 is 345175966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669571543 - 2⁹ = 669571031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669571493 and 669571502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669577543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334785771 + 334785772.

It is an arithmetic number, because the mean of its divisors is an integer number (334785772).

Almost surely, 2^669571543 is an apocalyptic number.

669571543 is a deficient number, since it is larger than the sum of its proper divisors (1).

669571543 is an equidigital number, since it uses as much as digits as its factorization.

669571543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 46.

The square root of 669571543 is about 25876.0805185020. The cubic root of 669571543 is about 874.8474479082.

The spelling of 669571543 in words is "six hundred sixty-nine million, five hundred seventy-one thousand, five hundred forty-three".