655550785 has 4 divisors (see below), whose sum is σ = 786660948. Its totient is φ = 524440624.

The previous prime is 655550767. The next prime is 655550789. The reversal of 655550785 is 587055556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 301057201 + 354493584 = 17351^2 + 18828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655550785 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655550789) 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 in 3 ways as a sum of consecutive naturals, for example, 65555074 + ... + 65555083.

It is an arithmetic number, because the mean of its divisors is an integer number (196665237).

Almost surely, 2^655550785 is an apocalyptic number.

It is an amenable number.

655550785 is a deficient number, since it is larger than the sum of its proper divisors (131110163).

655550785 is a wasteful number, since it uses less digits than its factorization.

655550785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131110162.

The product of its (nonzero) digits is 1050000, while the sum is 46.

The square root of 655550785 is about 25603.7259983777. The cubic root of 655550785 is about 868.6979178963.

The spelling of 655550785 in words is "six hundred fifty-five million, five hundred fifty thousand, seven hundred eighty-five".