518149665557 has 2 divisors, whose sum is σ = 518149665558. Its totient is φ = 518149665556.

The previous prime is 518149665511. The next prime is 518149665559. The reversal of 518149665557 is 755566941815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 462673400401 + 55476265156 = 680201^2 + 235534^2 .

It is a cyclic number.

It is not a de Polignac number, because 518149665557 - 2⁶ = 518149665493 is a prime.

Together with 518149665559, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 518149665557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518149665559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259074832778 + 259074832779.

It is an arithmetic number, because the mean of its divisors is an integer number (259074832779).

Almost surely, 2^518149665557 is an apocalyptic number.

It is an amenable number.

518149665557 is a deficient number, since it is larger than the sum of its proper divisors (1).

518149665557 is an equidigital number, since it uses as much as digits as its factorization.

518149665557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360000, while the sum is 62.

The spelling of 518149665557 in words is "five hundred eighteen billion, one hundred forty-nine million, six hundred sixty-five thousand, five hundred fifty-seven".