516691643 has 24 divisors (see below), whose sum is σ = 604998000. Its totient is φ = 439530624.

The previous prime is 516691639. The next prime is 516691673. The reversal of 516691643 is 346196615.

It is not a de Polignac number, because 516691643 - 2² = 516691639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 516691643.

It is not an unprimeable number, because it can be changed into a prime (516691603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116633 + ... + 120981.

It is an arithmetic number, because the mean of its divisors is an integer number (25208250).

Almost surely, 2^516691643 is an apocalyptic number.

516691643 is a deficient number, since it is larger than the sum of its proper divisors (88306357).

516691643 is a wasteful number, since it uses less digits than its factorization.

516691643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431 (or 4418 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The square root of 516691643 is about 22730.8522277542. The cubic root of 516691643 is about 802.4361380715.

The spelling of 516691643 in words is "five hundred sixteen million, six hundred ninety-one thousand, six hundred forty-three".