655408776787 has 2 divisors, whose sum is σ = 655408776788. Its totient is φ = 655408776786.

The previous prime is 655408776749. The next prime is 655408776833. The reversal of 655408776787 is 787677804556.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655408776787 is a prime.

It is not a weakly prime, because it can be changed into another prime (655408776727) 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, 327704388393 + 327704388394.

It is an arithmetic number, because the mean of its divisors is an integer number (327704388394).

Almost surely, 2^655408776787 is an apocalyptic number.

655408776787 is a deficient number, since it is larger than the sum of its proper divisors (1).

655408776787 is an equidigital number, since it uses as much as digits as its factorization.

655408776787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 553190400, while the sum is 70.

The spelling of 655408776787 in words is "six hundred fifty-five billion, four hundred eight million, seven hundred seventy-six thousand, seven hundred eighty-seven".