571664641 has 2 divisors, whose sum is σ = 571664642. Its totient is φ = 571664640.

The previous prime is 571664623. The next prime is 571664657. The reversal of 571664641 is 146466175.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 521665600 + 49999041 = 22840^2 + 7071^2 .

It is a cyclic number.

It is not a de Polignac number, because 571664641 - 2⁹ = 571664129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 571664594 and 571664603.

It is not a weakly prime, because it can be changed into another prime (571664671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 285832320 + 285832321.

It is an arithmetic number, because the mean of its divisors is an integer number (285832321).

Almost surely, 2^571664641 is an apocalyptic number.

It is an amenable number.

571664641 is a deficient number, since it is larger than the sum of its proper divisors (1).

571664641 is an equidigital number, since it uses as much as digits as its factorization.

571664641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 571664641 is about 23909.5094261677. The cubic root of 571664641 is about 829.9407907635.

The spelling of 571664641 in words is "five hundred seventy-one million, six hundred sixty-four thousand, six hundred forty-one".