51839799069 has 4 divisors (see below), whose sum is σ = 69119732096. Its totient is φ = 34559866044.

The previous prime is 51839799059. The next prime is 51839799169. The reversal of 51839799069 is 96099793815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51839799069 - 2⁹ = 51839798557 is a prime.

It is a super-2 number, since 2×51839799069² (a number of 22 digits) 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 (51839799019) 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 3 ways as a sum of consecutive naturals, for example, 8639966509 + ... + 8639966514.

It is an arithmetic number, because the mean of its divisors is an integer number (17279933024).

Almost surely, 2^51839799069 is an apocalyptic number.

It is an amenable number.

51839799069 is a deficient number, since it is larger than the sum of its proper divisors (17279933027).

51839799069 is a wasteful number, since it uses less digits than its factorization.

51839799069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17279933026.

The product of its (nonzero) digits is 33067440, while the sum is 66.

The spelling of 51839799069 in words is "fifty-one billion, eight hundred thirty-nine million, seven hundred ninety-nine thousand, sixty-nine".