5256138062081 has 2 divisors, whose sum is σ = 5256138062082. Its totient is φ = 5256138062080.

The previous prime is 5256138062033. The next prime is 5256138062167. The reversal of 5256138062081 is 1802608316525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5237964595600 + 18173466481 = 2288660^2 + 134809^2 .

It is a cyclic number.

It is not a de Polignac number, because 5256138062081 - 2¹⁸ = 5256137799937 is a prime.

It is a super-2 number, since 2×5256138062081² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5256138064081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628069031040 + 2628069031041.

It is an arithmetic number, because the mean of its divisors is an integer number (2628069031041).

Almost surely, 2^{5256138062081} is an apocalyptic number.

It is an amenable number.

5256138062081 is a deficient number, since it is larger than the sum of its proper divisors (1).

5256138062081 is an equidigital number, since it uses as much as digits as its factorization.

5256138062081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 5256138062081 in words is "five trillion, two hundred fifty-six billion, one hundred thirty-eight million, sixty-two thousand, eighty-one".