6554589781 has 2 divisors, whose sum is σ = 6554589782. Its totient is φ = 6554589780.

The previous prime is 6554589737. The next prime is 6554589791. The reversal of 6554589781 is 1879854556.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3864611556 + 2689978225 = 62166^2 + 51865^2 .

It is a cyclic number.

It is not a de Polignac number, because 6554589781 - 2⁹ = 6554589269 is a prime.

It is a super-2 number, since 2×6554589781² = 85925294394379255922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6554589791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277294890 + 3277294891.

It is an arithmetic number, because the mean of its divisors is an integer number (3277294891).

Almost surely, 2^6554589781 is an apocalyptic number.

It is an amenable number.

6554589781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6554589781 is an equidigital number, since it uses as much as digits as its factorization.

6554589781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096000, while the sum is 58.

The square root of 6554589781 is about 80960.4210772153. The cubic root of 6554589781 is about 1871.4655579092.

The spelling of 6554589781 in words is "six billion, five hundred fifty-four million, five hundred eighty-nine thousand, seven hundred eighty-one".