6489559861 has 2 divisors, whose sum is σ = 6489559862. Its totient is φ = 6489559860.

The previous prime is 6489559831. The next prime is 6489559891. The reversal of 6489559861 is 1689559846.

It is a balanced prime because it is at equal distance from previous prime (6489559831) and next prime (6489559891).

It can be written as a sum of positive squares in only one way, i.e., 6257759236 + 231800625 = 79106^2 + 15225^2 .

It is a cyclic number.

It is not a de Polignac number, because 6489559861 - 2¹⁹ = 6489035573 is a prime.

It is a super-2 number, since 2×6489559861² = 84228774379004678642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6489559861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6489559831) 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, 3244779930 + 3244779931.

It is an arithmetic number, because the mean of its divisors is an integer number (3244779931).

Almost surely, 2^6489559861 is an apocalyptic number.

It is an amenable number.

6489559861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6489559861 is an equidigital number, since it uses as much as digits as its factorization.

6489559861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18662400, while the sum is 61.

The square root of 6489559861 is about 80557.8044698340. The cubic root of 6489559861 is about 1865.2558651511.

The spelling of 6489559861 in words is "six billion, four hundred eighty-nine million, five hundred fifty-nine thousand, eight hundred sixty-one".