51928706581 has 2 divisors, whose sum is σ = 51928706582. Its totient is φ = 51928706580.

The previous prime is 51928706519. The next prime is 51928706633. The reversal of 51928706581 is 18560782915.

It is an a-pointer prime, because the next prime (51928706633) can be obtained adding 51928706581 to its sum of digits (52).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27600505956 + 24328200625 = 166134^2 + 155975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51928706581 is a prime.

It is a super-2 number, since 2×51928706581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51928706281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25964353290 + 25964353291.

It is an arithmetic number, because the mean of its divisors is an integer number (25964353291).

Almost surely, 2^51928706581 is an apocalyptic number.

It is an amenable number.

51928706581 is a deficient number, since it is larger than the sum of its proper divisors (1).

51928706581 is an equidigital number, since it uses as much as digits as its factorization.

51928706581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 52.

The spelling of 51928706581 in words is "fifty-one billion, nine hundred twenty-eight million, seven hundred six thousand, five hundred eighty-one".