516202666561 has 4 divisors (see below), whose sum is σ = 517106699824. Its totient is φ = 515298633300.

The previous prime is 516202666547. The next prime is 516202666571. The reversal of 516202666561 is 165666202615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165666202615 = 5 ⋅33133240523.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-516202666561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (516202666541) 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, 452015775 + ... + 452016916.

It is an arithmetic number, because the mean of its divisors is an integer number (129276674956).

Almost surely, 2^516202666561 is an apocalyptic number.

It is an amenable number.

516202666561 is a deficient number, since it is larger than the sum of its proper divisors (904033263).

516202666561 is an equidigital number, since it uses as much as digits as its factorization.

516202666561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904033262.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 516202666561 in words is "five hundred sixteen billion, two hundred two million, six hundred sixty-six thousand, five hundred sixty-one".