516330021665 has 4 divisors (see below), whose sum is σ = 619596026004. Its totient is φ = 413064017328.

The previous prime is 516330021653. The next prime is 516330021737. The reversal of 516330021665 is 566120033615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 292169437729 + 224160583936 = 540527^2 + 473456^2 .

It is a cyclic number.

It is not a de Polignac number, because 516330021665 - 2¹⁰ = 516330020641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51633002162 + ... + 51633002171.

It is an arithmetic number, because the mean of its divisors is an integer number (154899006501).

Almost surely, 2^516330021665 is an apocalyptic number.

It is an amenable number.

516330021665 is a deficient number, since it is larger than the sum of its proper divisors (103266004339).

516330021665 is a wasteful number, since it uses less digits than its factorization.

516330021665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103266004338.

The product of its (nonzero) digits is 97200, while the sum is 38.

The spelling of 516330021665 in words is "five hundred sixteen billion, three hundred thirty million, twenty-one thousand, six hundred sixty-five".