655911911 has 4 divisors (see below), whose sum is σ = 655989000. Its totient is φ = 655834824.

The previous prime is 655911889. The next prime is 655911923. The reversal of 655911911 is 119119556.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655911911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655911611) 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 in 3 ways as a sum of consecutive naturals, for example, 23936 + ... + 43413.

It is an arithmetic number, because the mean of its divisors is an integer number (163997250).

Almost surely, 2^655911911 is an apocalyptic number.

655911911 is a deficient number, since it is larger than the sum of its proper divisors (77089).

655911911 is an equidigital number, since it uses as much as digits as its factorization.

655911911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77088.

The product of its digits is 12150, while the sum is 38.

The square root of 655911911 is about 25610.7772431842. Note that the first 3 decimals coincide. The cubic root of 655911911 is about 868.8574030317.

The spelling of 655911911 in words is "six hundred fifty-five million, nine hundred eleven thousand, nine hundred eleven".