51185134786811 has 2 divisors, whose sum is σ = 51185134786812. Its totient is φ = 51185134786810.

The previous prime is 51185134786757. The next prime is 51185134786847. The reversal of 51185134786811 is 11868743158115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51185134786811 - 2¹⁰ = 51185134785787 is a prime.

It is not a weakly prime, because it can be changed into another prime (51185134716811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25592567393405 + 25592567393406.

It is an arithmetic number, because the mean of its divisors is an integer number (25592567393406).

Almost surely, 2^{51185134786811} is an apocalyptic number.

51185134786811 is a deficient number, since it is larger than the sum of its proper divisors (1).

51185134786811 is an equidigital number, since it uses as much as digits as its factorization.

51185134786811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6451200, while the sum is 59.

The spelling of 51185134786811 in words is "fifty-one trillion, one hundred eighty-five billion, one hundred thirty-four million, seven hundred eighty-six thousand, eight hundred eleven".