561665313 has 32 divisors (see below), whose sum is σ = 947220480. Its totient is φ = 325599120.

The previous prime is 561665311. The next prime is 561665333. The reversal of 561665313 is 313566165.

561665313 is a `hidden beast` number, since 5 + 61 + 66 + 531 + 3 = 666.

It is not a de Polignac number, because 561665313 - 2¹ = 561665311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561665311) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 34281 + ... + 47942.

It is an arithmetic number, because the mean of its divisors is an integer number (29600640).

Almost surely, 2^561665313 is an apocalyptic number.

It is an amenable number.

561665313 is a deficient number, since it is larger than the sum of its proper divisors (385555167).

561665313 is a wasteful number, since it uses less digits than its factorization.

561665313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82266 (or 82260 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 561665313 is about 23699.4791714924. The cubic root of 561665313 is about 825.0733025777.

The spelling of 561665313 in words is "five hundred sixty-one million, six hundred sixty-five thousand, three hundred thirteen".