556256663 has 2 divisors, whose sum is σ = 556256664. Its totient is φ = 556256662.

The previous prime is 556256639. The next prime is 556256683. The reversal of 556256663 is 366652655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 556256663 - 2¹⁰ = 556255639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556256683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278128331 + 278128332.

It is an arithmetic number, because the mean of its divisors is an integer number (278128332).

Almost surely, 2^556256663 is an apocalyptic number.

556256663 is a deficient number, since it is larger than the sum of its proper divisors (1).

556256663 is an equidigital number, since it uses as much as digits as its factorization.

556256663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 44.

The square root of 556256663 is about 23585.0940850360. The cubic root of 556256663 is about 822.4163620019.

The spelling of 556256663 in words is "five hundred fifty-six million, two hundred fifty-six thousand, six hundred sixty-three".