513566661 has 12 divisors (see below), whose sum is σ = 697930688. Its totient is φ = 335912304.

The previous prime is 513566659. The next prime is 513566671. The reversal of 513566661 is 166665315.

It is not a de Polignac number, because 513566661 - 2¹ = 513566659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513566611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22045 + ... + 38898.

Almost surely, 2^513566661 is an apocalyptic number.

It is an amenable number.

513566661 is a deficient number, since it is larger than the sum of its proper divisors (184364027).

513566661 is an equidigital number, since it uses as much as digits as its factorization.

513566661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61052 (or 60999 counting only the distinct ones).

The product of its digits is 97200, while the sum is 39.

The square root of 513566661 is about 22662.0092004217. The cubic root of 513566661 is about 800.8151384254.

The spelling of 513566661 in words is "five hundred thirteen million, five hundred sixty-six thousand, six hundred sixty-one".