655418809 has 2 divisors, whose sum is σ = 655418810. Its totient is φ = 655418808.

The previous prime is 655418801. The next prime is 655418837. The reversal of 655418809 is 908814556.

655418809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348643584 + 306775225 = 18672^2 + 17515^2 .

It is a cyclic number.

It is not a de Polignac number, because 655418809 - 2³ = 655418801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655418801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327709404 + 327709405.

It is an arithmetic number, because the mean of its divisors is an integer number (327709405).

Almost surely, 2^655418809 is an apocalyptic number.

It is an amenable number.

655418809 is a deficient number, since it is larger than the sum of its proper divisors (1).

655418809 is an equidigital number, since it uses as much as digits as its factorization.

655418809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 655418809 is about 25601.1485875146. The cubic root of 655418809 is about 868.6396183343.

The spelling of 655418809 in words is "six hundred fifty-five million, four hundred eighteen thousand, eight hundred nine".