51905404843 has 2 divisors, whose sum is σ = 51905404844. Its totient is φ = 51905404842.

The previous prime is 51905404777. The next prime is 51905404861. The reversal of 51905404843 is 34840450915.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51905404843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51905404843.

It is not a weakly prime, because it can be changed into another prime (51905494843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25952702421 + 25952702422.

It is an arithmetic number, because the mean of its divisors is an integer number (25952702422).

Almost surely, 2^51905404843 is an apocalyptic number.

51905404843 is a deficient number, since it is larger than the sum of its proper divisors (1).

51905404843 is an equidigital number, since it uses as much as digits as its factorization.

51905404843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 51905404843 in words is "fifty-one billion, nine hundred five million, four hundred four thousand, eight hundred forty-three".