51647556713 has 4 divisors (see below), whose sum is σ = 51658414080. Its totient is φ = 51636699348.

The previous prime is 51647556679. The next prime is 51647556761. The reversal of 51647556713 is 31765574615.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31765574615 = 5 ⋅6353114923.

It is a cyclic number.

It is not a de Polignac number, because 51647556713 - 2¹⁰ = 51647555689 is a prime.

It is a super-2 number, since 2×51647556713² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51647556613) 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, 5421545 + ... + 5431062.

It is an arithmetic number, because the mean of its divisors is an integer number (12914603520).

Almost surely, 2^51647556713 is an apocalyptic number.

It is an amenable number.

51647556713 is a deficient number, since it is larger than the sum of its proper divisors (10857367).

51647556713 is a wasteful number, since it uses less digits than its factorization.

51647556713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10857366.

The product of its digits is 2646000, while the sum is 50.

The spelling of 51647556713 in words is "fifty-one billion, six hundred forty-seven million, five hundred fifty-six thousand, seven hundred thirteen".