51693310369 has 4 divisors (see below), whose sum is σ = 51695459460. Its totient is φ = 51691161280.

The previous prime is 51693310363. The next prime is 51693310391. The reversal of 51693310369 is 96301339615.

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 43747905600 + 7945404769 = 209160^2 + 89137^2 .

It is a cyclic number.

It is not a de Polignac number, because 51693310369 - 2¹⁹ = 51692786081 is a prime.

It is a super-3 number, since 3×51693310369³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51693310363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1038052 + ... + 1086709.

It is an arithmetic number, because the mean of its divisors is an integer number (12923864865).

Almost surely, 2^51693310369 is an apocalyptic number.

It is an amenable number.

51693310369 is a deficient number, since it is larger than the sum of its proper divisors (2149091).

51693310369 is a wasteful number, since it uses less digits than its factorization.

51693310369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149090.

The product of its (nonzero) digits is 393660, while the sum is 46.

The spelling of 51693310369 in words is "fifty-one billion, six hundred ninety-three million, three hundred ten thousand, three hundred sixty-nine".