556065661 has 2 divisors, whose sum is σ = 556065662. Its totient is φ = 556065660.

The previous prime is 556065613. The next prime is 556065667. The reversal of 556065661 is 166560655.

556065661 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., 452412900 + 103652761 = 21270^2 + 10181^2 .

It is a cyclic number.

It is not a de Polignac number, because 556065661 - 2¹⁹ = 555541373 is a prime.

It is a super-3 number, since 3×556065661³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556065667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278032830 + 278032831.

It is an arithmetic number, because the mean of its divisors is an integer number (278032831).

Almost surely, 2^556065661 is an apocalyptic number.

It is an amenable number.

556065661 is a deficient number, since it is larger than the sum of its proper divisors (1).

556065661 is an equidigital number, since it uses as much as digits as its factorization.

556065661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 556065661 is about 23581.0445273317. The cubic root of 556065661 is about 822.3222201168.

The spelling of 556065661 in words is "five hundred fifty-six million, sixty-five thousand, six hundred sixty-one".