518383661 has 2 divisors, whose sum is σ = 518383662. Its totient is φ = 518383660.

The previous prime is 518383651. The next prime is 518383753. The reversal of 518383661 is 166383815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 462508036 + 55875625 = 21506^2 + 7475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518383661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518383651) 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 as a sum of consecutive naturals, namely, 259191830 + 259191831.

It is an arithmetic number, because the mean of its divisors is an integer number (259191831).

Almost surely, 2^518383661 is an apocalyptic number.

It is an amenable number.

518383661 is a deficient number, since it is larger than the sum of its proper divisors (1).

518383661 is an equidigital number, since it uses as much as digits as its factorization.

518383661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 518383661 is about 22768.0403416719. The cubic root of 518383661 is about 803.3111002993.

The spelling of 518383661 in words is "five hundred eighteen million, three hundred eighty-three thousand, six hundred sixty-one".