555646561 has 2 divisors, whose sum is σ = 555646562. Its totient is φ = 555646560.

The previous prime is 555646471. The next prime is 555646607. The reversal of 555646561 is 165646555.

555646561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 287505936 + 268140625 = 16956^2 + 16375^2 .

It is a cyclic number.

It is not a de Polignac number, because 555646561 - 2¹¹ = 555644513 is a prime.

It is a super-2 number, since 2×555646561² = 617486201502253442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (555646661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277823280 + 277823281.

It is an arithmetic number, because the mean of its divisors is an integer number (277823281).

Almost surely, 2^555646561 is an apocalyptic number.

It is an amenable number.

555646561 is a deficient number, since it is larger than the sum of its proper divisors (1).

555646561 is an equidigital number, since it uses as much as digits as its factorization.

555646561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540000, while the sum is 43.

The square root of 555646561 is about 23572.1564775054. The cubic root of 555646561 is about 822.1155767379.

The spelling of 555646561 in words is "five hundred fifty-five million, six hundred forty-six thousand, five hundred sixty-one".