5638819693 has 18 divisors (see below), whose sum is σ = 6158190462. Its totient is φ = 5160692160.

The previous prime is 5638819621. The next prime is 5638819699. The reversal of 5638819693 is 3969188365.

It can be written as a sum of positive squares in 9 ways, for example, as 4355604009 + 1283215684 = 65997^2 + 35822^2 .

It is not a de Polignac number, because 5638819693 - 2⁹ = 5638819181 is a prime.

It is a super-2 number, since 2×5638819693² = 63592575060329228498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5638819699) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12231483 + ... + 12231943.

Almost surely, 2^5638819693 is an apocalyptic number.

It is an amenable number.

5638819693 is a deficient number, since it is larger than the sum of its proper divisors (519370769).

5638819693 is an equidigital number, since it uses as much as digits as its factorization.

5638819693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 631 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 58.

The square root of 5638819693 is about 75092.0747682470. The cubic root of 5638819693 is about 1779.9019107038.

The spelling of 5638819693 in words is "five billion, six hundred thirty-eight million, eight hundred nineteen thousand, six hundred ninety-three".