655798565 has 4 divisors (see below), whose sum is σ = 786958284. Its totient is φ = 524638848.

The previous prime is 655798543. The next prime is 655798573. The reversal of 655798565 is 565897556.

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 492751204 + 163047361 = 22198^2 + 12769^2 .

It is a cyclic number.

It is not a de Polignac number, because 655798565 - 2¹⁸ = 655536421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655798565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65579852 + ... + 65579861.

It is an arithmetic number, because the mean of its divisors is an integer number (196739571).

Almost surely, 2^655798565 is an apocalyptic number.

It is an amenable number.

655798565 is a deficient number, since it is larger than the sum of its proper divisors (131159719).

655798565 is a wasteful number, since it uses less digits than its factorization.

655798565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131159718.

The product of its digits is 11340000, while the sum is 56.

The square root of 655798565 is about 25608.5642900964. The cubic root of 655798565 is about 868.8073520097.

The spelling of 655798565 in words is "six hundred fifty-five million, seven hundred ninety-eight thousand, five hundred sixty-five".