556661257 has 4 divisors (see below), whose sum is σ = 556930836. Its totient is φ = 556391680.

The previous prime is 556661239. The next prime is 556661299. The reversal of 556661257 is 752166655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 314672121 + 241989136 = 17739^2 + 15556^2 .

It is a cyclic number.

It is not a de Polignac number, because 556661257 - 2¹⁹ = 556136969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556661057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131668 + ... + 135829.

It is an arithmetic number, because the mean of its divisors is an integer number (139232709).

Almost surely, 2^556661257 is an apocalyptic number.

It is an amenable number.

556661257 is a deficient number, since it is larger than the sum of its proper divisors (269579).

556661257 is a wasteful number, since it uses less digits than its factorization.

556661257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269578.

The product of its digits is 378000, while the sum is 43.

The square root of 556661257 is about 23593.6698501950. The cubic root of 556661257 is about 822.6157088779.

The spelling of 556661257 in words is "five hundred fifty-six million, six hundred sixty-one thousand, two hundred fifty-seven".