52005366781 has 2 divisors, whose sum is σ = 52005366782. Its totient is φ = 52005366780.

The previous prime is 52005366713. The next prime is 52005366793. The reversal of 52005366781 is 18766350025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50800652100 + 1204714681 = 225390^2 + 34709^2 .

It is a cyclic number.

It is not a de Polignac number, because 52005366781 - 2²⁷ = 51871149053 is a prime.

It is a super-2 number, since 2×52005366781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52005366481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26002683390 + 26002683391.

It is an arithmetic number, because the mean of its divisors is an integer number (26002683391).

Almost surely, 2^52005366781 is an apocalyptic number.

It is an amenable number.

52005366781 is a deficient number, since it is larger than the sum of its proper divisors (1).

52005366781 is an equidigital number, since it uses as much as digits as its factorization.

52005366781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 52005366781 in words is "fifty-two billion, five million, three hundred sixty-six thousand, seven hundred eighty-one".