655409779 has 2 divisors, whose sum is σ = 655409780. Its totient is φ = 655409778.

The previous prime is 655409747. The next prime is 655409791. The reversal of 655409779 is 977904556.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 655409779 - 2⁵ = 655409747 is a prime.

It is not a weakly prime, because it can be changed into another prime (655401779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327704889 + 327704890.

It is an arithmetic number, because the mean of its divisors is an integer number (327704890).

Almost surely, 2^655409779 is an apocalyptic number.

655409779 is a deficient number, since it is larger than the sum of its proper divisors (1).

655409779 is an equidigital number, since it uses as much as digits as its factorization.

655409779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2381400, while the sum is 52.

The square root of 655409779 is about 25600.9722276323. The cubic root of 655409779 is about 868.6356291029.

The spelling of 655409779 in words is "six hundred fifty-five million, four hundred nine thousand, seven hundred seventy-nine".