51500538541 has 2 divisors, whose sum is σ = 51500538542. Its totient is φ = 51500538540.

The previous prime is 51500538511. The next prime is 51500538547. The reversal of 51500538541 is 14583500515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32380562916 + 19119975625 = 179946^2 + 138275^2 .

It is a cyclic number.

It is not a de Polignac number, because 51500538541 - 2⁹ = 51500538029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51500538541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51500538547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25750269270 + 25750269271.

It is an arithmetic number, because the mean of its divisors is an integer number (25750269271).

Almost surely, 2^51500538541 is an apocalyptic number.

It is an amenable number.

51500538541 is a deficient number, since it is larger than the sum of its proper divisors (1).

51500538541 is an equidigital number, since it uses as much as digits as its factorization.

51500538541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60000, while the sum is 37.

The spelling of 51500538541 in words is "fifty-one billion, five hundred million, five hundred thirty-eight thousand, five hundred forty-one".