516655675050721 has 2 divisors, whose sum is σ = 516655675050722. Its totient is φ = 516655675050720.

The previous prime is 516655675050701. The next prime is 516655675050743. The reversal of 516655675050721 is 127050576556615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438426603172321 + 78229071878400 = 20938639^2 + 8844720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-516655675050721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 516655675050721.

It is not a weakly prime, because it can be changed into another prime (516655675050701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258327837525360 + 258327837525361.

It is an arithmetic number, because the mean of its divisors is an integer number (258327837525361).

Almost surely, 2^{516655675050721} is an apocalyptic number.

It is an amenable number.

516655675050721 is a deficient number, since it is larger than the sum of its proper divisors (1).

516655675050721 is an equidigital number, since it uses as much as digits as its factorization.

516655675050721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 66150000, while the sum is 61.

The spelling of 516655675050721 in words is "five hundred sixteen trillion, six hundred fifty-five billion, six hundred seventy-five million, fifty thousand, seven hundred twenty-one".