556551643 has 2 divisors, whose sum is σ = 556551644. Its totient is φ = 556551642.

The previous prime is 556551641. The next prime is 556551683. The reversal of 556551643 is 346155655.

556551643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (556551683) can be obtained adding 556551643 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 556551643 - 2¹ = 556551641 is a prime.

Together with 556551641, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 556551596 and 556551605.

It is not a weakly prime, because it can be changed into another prime (556551641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278275821 + 278275822.

It is an arithmetic number, because the mean of its divisors is an integer number (278275822).

Almost surely, 2^556551643 is an apocalyptic number.

556551643 is a deficient number, since it is larger than the sum of its proper divisors (1).

556551643 is an equidigital number, since it uses as much as digits as its factorization.

556551643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270000, while the sum is 40.

The square root of 556551643 is about 23591.3467822420. The cubic root of 556551643 is about 822.5617106780.

The spelling of 556551643 in words is "five hundred fifty-six million, five hundred fifty-one thousand, six hundred forty-three".