669571481 has 2 divisors, whose sum is σ = 669571482. Its totient is φ = 669571480.

The previous prime is 669571477. The next prime is 669571543. The reversal of 669571481 is 184175966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668687881 + 883600 = 25859^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 669571481 - 2² = 669571477 is a prime.

It is a super-2 number, since 2×669571481² = 896651936337066722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (669571411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334785740 + 334785741.

It is an arithmetic number, because the mean of its divisors is an integer number (334785741).

Almost surely, 2^669571481 is an apocalyptic number.

It is an amenable number.

669571481 is a deficient number, since it is larger than the sum of its proper divisors (1).

669571481 is an equidigital number, since it uses as much as digits as its factorization.

669571481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 669571481 is about 25876.0793204844. The cubic root of 669571481 is about 874.8474209056.

The spelling of 669571481 in words is "six hundred sixty-nine million, five hundred seventy-one thousand, four hundred eighty-one".