51693930549 has 6 divisors (see below), whose sum is σ = 74669010806. Its totient is φ = 34462620360.

The previous prime is 51693930523. The next prime is 51693930551. The reversal of 51693930549 is 94503939615.

51693930549 is a `hidden beast` number, since 5 + 1 + 6 + 9 + 3 + 93 + 0 + 549 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44265214449 + 7428716100 = 210393^2 + 86190^2 .

It is not a de Polignac number, because 51693930549 - 2²¹ = 51691833397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51693930495 and 51693930504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51693930049) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2871885022 + ... + 2871885039.

Almost surely, 2^51693930549 is an apocalyptic number.

It is an amenable number.

51693930549 is a deficient number, since it is larger than the sum of its proper divisors (22975080257).

51693930549 is a wasteful number, since it uses less digits than its factorization.

51693930549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5743770067 (or 5743770064 counting only the distinct ones).

The product of its (nonzero) digits is 3936600, while the sum is 54.

The spelling of 51693930549 in words is "fifty-one billion, six hundred ninety-three million, nine hundred thirty thousand, five hundred forty-nine".