51972955717 has 4 divisors (see below), whose sum is σ = 52003156716. Its totient is φ = 51942754720.

The previous prime is 51972955691. The next prime is 51972955739. The reversal of 51972955717 is 71755927915.

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 41387426721 + 10585528996 = 203439^2 + 102886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51972955717 is a prime.

It is a super-2 number, since 2×51972955717² (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 (51972955777) 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, 15097918 + ... + 15101359.

It is an arithmetic number, because the mean of its divisors is an integer number (13000789179).

Almost surely, 2^51972955717 is an apocalyptic number.

It is an amenable number.

51972955717 is a deficient number, since it is larger than the sum of its proper divisors (30200999).

51972955717 is a wasteful number, since it uses less digits than its factorization.

51972955717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30200998.

The product of its digits is 6945750, while the sum is 58.

The spelling of 51972955717 in words is "fifty-one billion, nine hundred seventy-two million, nine hundred fifty-five thousand, seven hundred seventeen".