516663344621 has 8 divisors (see below), whose sum is σ = 518529864384. Its totient is φ = 514800156640.

The previous prime is 516663344573. The next prime is 516663344641. The reversal of 516663344621 is 126443366615.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-516663344621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516663344641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522035 + ... + 1142736.

It is an arithmetic number, because the mean of its divisors is an integer number (64816233048).

Almost surely, 2^516663344621 is an apocalyptic number.

It is an amenable number.

516663344621 is a deficient number, since it is larger than the sum of its proper divisors (1866519763).

516663344621 is a wasteful number, since it uses less digits than its factorization.

516663344621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665891.

The product of its digits is 1866240, while the sum is 47.

The spelling of 516663344621 in words is "five hundred sixteen billion, six hundred sixty-three million, three hundred forty-four thousand, six hundred twenty-one".