655485689 has 2 divisors, whose sum is σ = 655485690. Its totient is φ = 655485688.

The previous prime is 655485661. The next prime is 655485709. The reversal of 655485689 is 986584556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 598634089 + 56851600 = 24467^2 + 7540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655485689 is a prime.

It is a super-2 number, since 2×655485689² = 859322976967609442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (655425689) 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, 327742844 + 327742845.

It is an arithmetic number, because the mean of its divisors is an integer number (327742845).

Almost surely, 2^655485689 is an apocalyptic number.

It is an amenable number.

655485689 is a deficient number, since it is larger than the sum of its proper divisors (1).

655485689 is an equidigital number, since it uses as much as digits as its factorization.

655485689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368000, while the sum is 56.

The square root of 655485689 is about 25602.4547455903. The cubic root of 655485689 is about 868.6691631286.

The spelling of 655485689 in words is "six hundred fifty-five million, four hundred eighty-five thousand, six hundred eighty-nine".