557668213 has 2 divisors, whose sum is σ = 557668214. Its totient is φ = 557668212.

The previous prime is 557668201. The next prime is 557668249. The reversal of 557668213 is 312866755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517244049 + 40424164 = 22743^2 + 6358^2 .

It is a cyclic number.

It is not a de Polignac number, because 557668213 - 2⁹ = 557667701 is a prime.

It is a super-2 number, since 2×557668213² = 621987671581226738, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 557668213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (557668253) 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, 278834106 + 278834107.

It is an arithmetic number, because the mean of its divisors is an integer number (278834107).

Almost surely, 2^557668213 is an apocalyptic number.

It is an amenable number.

557668213 is a deficient number, since it is larger than the sum of its proper divisors (1).

557668213 is an equidigital number, since it uses as much as digits as its factorization.

557668213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 43.

The square root of 557668213 is about 23614.9997459242. Note that the first 3 decimals coincide. The cubic root of 557668213 is about 823.1114255870. Note that the first 3 decimals are identical.

The spelling of 557668213 in words is "five hundred fifty-seven million, six hundred sixty-eight thousand, two hundred thirteen".