516556660651 has 2 divisors, whose sum is σ = 516556660652. Its totient is φ = 516556660650.

The previous prime is 516556660649. The next prime is 516556660693. The reversal of 516556660651 is 156066655615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 516556660651 - 2¹ = 516556660649 is a prime.

Together with 516556660649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (516556660601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258278330325 + 258278330326.

It is an arithmetic number, because the mean of its divisors is an integer number (258278330326).

Almost surely, 2^516556660651 is an apocalyptic number.

516556660651 is a deficient number, since it is larger than the sum of its proper divisors (1).

516556660651 is an equidigital number, since it uses as much as digits as its factorization.

516556660651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860000, while the sum is 52.

The spelling of 516556660651 in words is "five hundred sixteen billion, five hundred fifty-six million, six hundred sixty thousand, six hundred fifty-one".