557657861 has 2 divisors, whose sum is σ = 557657862. Its totient is φ = 557657860.

The previous prime is 557657857. The next prime is 557657869. The reversal of 557657861 is 168756755.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 449185636 + 108472225 = 21194^2 + 10415^2 .

It is a cyclic number.

It is not a de Polignac number, because 557657861 - 2² = 557657857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (557657869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278828930 + 278828931.

It is an arithmetic number, because the mean of its divisors is an integer number (278828931).

Almost surely, 2^557657861 is an apocalyptic number.

It is an amenable number.

557657861 is a deficient number, since it is larger than the sum of its proper divisors (1).

557657861 is an equidigital number, since it uses as much as digits as its factorization.

557657861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764000, while the sum is 50.

The square root of 557657861 is about 23614.7805621818. The cubic root of 557657861 is about 823.1063324140.

The spelling of 557657861 in words is "five hundred fifty-seven million, six hundred fifty-seven thousand, eight hundred sixty-one".