28265956034581 has 2 divisors, whose sum is σ = 28265956034582. Its totient is φ = 28265956034580.

The previous prime is 28265956034539. The next prime is 28265956034587. The reversal of 28265956034581 is 18543065956282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16445733851556 + 11820222183025 = 4055334^2 + 3438055^2 .

It is a cyclic number.

It is not a de Polignac number, because 28265956034581 - 2²³ = 28265947645973 is a prime.

It is a super-2 number, since 2×28265956034581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28265956034587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14132978017290 + 14132978017291.

It is an arithmetic number, because the mean of its divisors is an integer number (14132978017291).

Almost surely, 2^{28265956034581} is an apocalyptic number.

It is an amenable number.

28265956034581 is a deficient number, since it is larger than the sum of its proper divisors (1).

28265956034581 is an equidigital number, since it uses as much as digits as its factorization.

28265956034581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416000, while the sum is 64.

The spelling of 28265956034581 in words is "twenty-eight trillion, two hundred sixty-five billion, nine hundred fifty-six million, thirty-four thousand, five hundred eighty-one".