655170561 has 24 divisors (see below), whose sum is σ = 965391336. Its totient is φ = 428048640.

The previous prime is 655170541. The next prime is 655170589. The reversal of 655170561 is 165071556.

It can be written as a sum of positive squares in 4 ways, for example, as 12852225 + 642318336 = 3585^2 + 25344^2 .

It is not a de Polignac number, because 655170561 - 2⁹ = 655170049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (655170511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158821 + ... + 162893.

It is an arithmetic number, because the mean of its divisors is an integer number (40224639).

Almost surely, 2^655170561 is an apocalyptic number.

655170561 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

655170561 is a deficient number, since it is larger than the sum of its proper divisors (310220775).

655170561 is a wasteful number, since it uses less digits than its factorization.

655170561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4433 (or 4430 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 655170561 is about 25596.2997521126. The cubic root of 655170561 is about 868.5299351435.

The spelling of 655170561 in words is "six hundred fifty-five million, one hundred seventy thousand, five hundred sixty-one".