51782218811 has 2 divisors, whose sum is σ = 51782218812. Its totient is φ = 51782218810.

The previous prime is 51782218801. The next prime is 51782218931. The reversal of 51782218811 is 11881228715.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51782218811 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (51782218801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25891109405 + 25891109406.

It is an arithmetic number, because the mean of its divisors is an integer number (25891109406).

Almost surely, 2^51782218811 is an apocalyptic number.

51782218811 is a deficient number, since it is larger than the sum of its proper divisors (1).

51782218811 is an equidigital number, since it uses as much as digits as its factorization.

51782218811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71680, while the sum is 44.

The spelling of 51782218811 in words is "fifty-one billion, seven hundred eighty-two million, two hundred eighteen thousand, eight hundred eleven".