655955777 has 2 divisors, whose sum is σ = 655955778. Its totient is φ = 655955776.

The previous prime is 655955767. The next prime is 655955779. The reversal of 655955777 is 777559556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650046016 + 5909761 = 25496^2 + 2431^2 .

It is a cyclic number.

It is not a de Polignac number, because 655955777 - 2¹⁰ = 655954753 is a prime.

Together with 655955779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655955779) 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, 327977888 + 327977889.

It is an arithmetic number, because the mean of its divisors is an integer number (327977889).

Almost surely, 2^655955777 is an apocalyptic number.

It is an amenable number.

655955777 is a deficient number, since it is larger than the sum of its proper divisors (1).

655955777 is an equidigital number, since it uses as much as digits as its factorization.

655955777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11576250, while the sum is 56.

The square root of 655955777 is about 25611.6336261473. The cubic root of 655955777 is about 868.8767717145.

The spelling of 655955777 in words is "six hundred fifty-five million, nine hundred fifty-five thousand, seven hundred seventy-seven".