53005780781 has 2 divisors, whose sum is σ = 53005780782. Its totient is φ = 53005780780.

The previous prime is 53005780721. The next prime is 53005780783. The reversal of 53005780781 is 18708750035.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52136415556 + 869365225 = 228334^2 + 29485^2 .

It is a cyclic number.

It is not a de Polignac number, because 53005780781 - 2¹⁸ = 53005518637 is a prime.

It is a super-2 number, since 2×53005780781² (a number of 22 digits) contains 22 as substring.

Together with 53005780783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53005780783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26502890390 + 26502890391.

It is an arithmetic number, because the mean of its divisors is an integer number (26502890391).

Almost surely, 2^53005780781 is an apocalyptic number.

It is an amenable number.

53005780781 is a deficient number, since it is larger than the sum of its proper divisors (1).

53005780781 is an equidigital number, since it uses as much as digits as its factorization.

53005780781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 44.

The spelling of 53005780781 in words is "fifty-three billion, five million, seven hundred eighty thousand, seven hundred eighty-one".