655231565 has 4 divisors (see below), whose sum is σ = 786277884. Its totient is φ = 524185248.

The previous prime is 655231553. The next prime is 655231571. The reversal of 655231565 is 565132556.

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 107765161 + 547466404 = 10381^2 + 23398^2 .

It is a cyclic number.

It is not a de Polignac number, because 655231565 - 2¹⁴ = 655215181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 65523152 + ... + 65523161.

It is an arithmetic number, because the mean of its divisors is an integer number (196569471).

Almost surely, 2^655231565 is an apocalyptic number.

It is an amenable number.

655231565 is a deficient number, since it is larger than the sum of its proper divisors (131046319).

655231565 is a wasteful number, since it uses less digits than its factorization.

655231565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131046318.

The product of its digits is 135000, while the sum is 38.

The square root of 655231565 is about 25597.4913809928. The cubic root of 655231565 is about 868.5568910533.

Subtracting from 655231565 its reverse (565132556), we obtain a palindrome (90099009).

The spelling of 655231565 in words is "six hundred fifty-five million, two hundred thirty-one thousand, five hundred sixty-five".