513793968866 has 8 divisors (see below), whose sum is σ = 777511227564. Its totient is φ = 254623559680.

The previous prime is 513793968859. The next prime is 513793968869. The reversal of 513793968866 is 668869397315.

It can be written as a sum of positive squares in 2 ways, for example, as 462235454641 + 51558514225 = 679879^2 + 227065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 513793968866.

It is not an unprimeable number, because it can be changed into a prime (513793968869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1136712095 + ... + 1136712546.

Almost surely, 2^513793968866 is an apocalyptic number.

513793968866 is a deficient number, since it is larger than the sum of its proper divisors (263717258698).

513793968866 is a wasteful number, since it uses less digits than its factorization.

513793968866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273424756.

The product of its digits is 352719360, while the sum is 71.

The spelling of 513793968866 in words is "five hundred thirteen billion, seven hundred ninety-three million, nine hundred sixty-eight thousand, eight hundred sixty-six".