51784836774509 has 2 divisors, whose sum is σ = 51784836774510. Its totient is φ = 51784836774508.

The previous prime is 51784836774491. The next prime is 51784836774529. The reversal of 51784836774509 is 90547763848715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40698300948484 + 11086535826025 = 6379522^2 + 3329645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51784836774509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51784836774529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25892418387254 + 25892418387255.

It is an arithmetic number, because the mean of its divisors is an integer number (25892418387255).

Almost surely, 2^{51784836774509} is an apocalyptic number.

It is an amenable number.

51784836774509 is a deficient number, since it is larger than the sum of its proper divisors (1).

51784836774509 is an equidigital number, since it uses as much as digits as its factorization.

51784836774509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1422489600, while the sum is 74.

The spelling of 51784836774509 in words is "fifty-one trillion, seven hundred eighty-four billion, eight hundred thirty-six million, seven hundred seventy-four thousand, five hundred nine".