52778536781 has 2 divisors, whose sum is σ = 52778536782. Its totient is φ = 52778536780.

The previous prime is 52778536757. The next prime is 52778536807. The reversal of 52778536781 is 18763587725.

52778536781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52260246025 + 518290756 = 228605^2 + 22766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52778536781 is a prime.

It is a super-2 number, since 2×52778536781² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 52778536781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52778536721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26389268390 + 26389268391.

It is an arithmetic number, because the mean of its divisors is an integer number (26389268391).

Almost surely, 2^52778536781 is an apocalyptic number.

It is an amenable number.

52778536781 is a deficient number, since it is larger than the sum of its proper divisors (1).

52778536781 is an equidigital number, since it uses as much as digits as its factorization.

52778536781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19756800, while the sum is 59.

The spelling of 52778536781 in words is "fifty-two billion, seven hundred seventy-eight million, five hundred thirty-six thousand, seven hundred eighty-one".