516550660261 has 2 divisors, whose sum is σ = 516550660262. Its totient is φ = 516550660260.

The previous prime is 516550660183. The next prime is 516550660319. The reversal of 516550660261 is 162066055615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273889989025 + 242660671236 = 523345^2 + 492606^2 .

It is a cyclic number.

It is not a de Polignac number, because 516550660261 - 2⁹ = 516550659749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (516550660861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258275330130 + 258275330131.

It is an arithmetic number, because the mean of its divisors is an integer number (258275330131).

Almost surely, 2^516550660261 is an apocalyptic number.

It is an amenable number.

516550660261 is a deficient number, since it is larger than the sum of its proper divisors (1).

516550660261 is an equidigital number, since it uses as much as digits as its factorization.

516550660261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 516550660261 in words is "five hundred sixteen billion, five hundred fifty million, six hundred sixty thousand, two hundred sixty-one".