655564816 has 45 divisors (see below), whose sum is σ = 1313002551. Its totient is φ = 317079936.

The previous prime is 655564801. The next prime is 655564849. The reversal of 655564816 is 618465556.

The square root of 655564816 is 25604.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 424524816 + 231040000 = 20604^2 + 15200^2 .

It is a super-2 number, since 2×655564816² = 859530455954227712, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3789306 + ... + 3789478.

Almost surely, 2^655564816 is an apocalyptic number.

655564816 is the 25604-th square number.

It is an amenable number.

655564816 is an abundant number, since it is smaller than the sum of its proper divisors (657437735).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

655564816 is an equidigital number, since it uses as much as digits as its factorization.

655564816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 212 counting only the distinct ones).

The product of its digits is 864000, while the sum is 46.

The cubic root of 655564816 is about 868.7041155415.

It can be divided in two parts, 65 and 5564816, that added together give a square (5564881 = 2359²).

The spelling of 655564816 in words is "six hundred fifty-five million, five hundred sixty-four thousand, eight hundred sixteen".