51508611373 has 2 divisors, whose sum is σ = 51508611374. Its totient is φ = 51508611372.

The previous prime is 51508611367. The next prime is 51508611397. The reversal of 51508611373 is 37311680515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33825462889 + 17683148484 = 183917^2 + 132978^2 .

It is a cyclic number.

It is not a de Polignac number, because 51508611373 - 2²¹ = 51506514221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51508614373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25754305686 + 25754305687.

It is an arithmetic number, because the mean of its divisors is an integer number (25754305687).

Almost surely, 2^51508611373 is an apocalyptic number.

It is an amenable number.

51508611373 is a deficient number, since it is larger than the sum of its proper divisors (1).

51508611373 is an equidigital number, since it uses as much as digits as its factorization.

51508611373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 51508611373 in words is "fifty-one billion, five hundred eight million, six hundred eleven thousand, three hundred seventy-three".