825464032781 has 2 divisors, whose sum is σ = 825464032782. Its totient is φ = 825464032780.

The previous prime is 825464032777. The next prime is 825464032817. The reversal of 825464032781 is 187230464528.

Together with next prime (825464032817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651303877156 + 174160155625 = 807034^2 + 417325^2 .

It is a cyclic number.

It is not a de Polignac number, because 825464032781 - 2² = 825464032777 is a prime.

It is a super-2 number, since 2×825464032781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825464038781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412732016390 + 412732016391.

It is an arithmetic number, because the mean of its divisors is an integer number (412732016391).

Almost surely, 2^825464032781 is an apocalyptic number.

It is an amenable number.

825464032781 is a deficient number, since it is larger than the sum of its proper divisors (1).

825464032781 is an equidigital number, since it uses as much as digits as its factorization.

825464032781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2580480, while the sum is 50.

The spelling of 825464032781 in words is "eight hundred twenty-five billion, four hundred sixty-four million, thirty-two thousand, seven hundred eighty-one".