825027578209 has 2 divisors, whose sum is σ = 825027578210. Its totient is φ = 825027578208.

The previous prime is 825027578203. The next prime is 825027578321. The reversal of 825027578209 is 902875720528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 614624640400 + 210402937809 = 783980^2 + 458697^2 .

It is a cyclic number.

It is not a de Polignac number, because 825027578209 - 2²¹ = 825025481057 is a prime.

It is a super-4 number, since 4×825027578209⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 825027578209.

It is not a weakly prime, because it can be changed into another prime (825027578203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412513789104 + 412513789105.

It is an arithmetic number, because the mean of its divisors is an integer number (412513789105).

Almost surely, 2^825027578209 is an apocalyptic number.

It is an amenable number.

825027578209 is a deficient number, since it is larger than the sum of its proper divisors (1).

825027578209 is an equidigital number, since it uses as much as digits as its factorization.

825027578209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5644800, while the sum is 55.

The spelling of 825027578209 in words is "eight hundred twenty-five billion, twenty-seven million, five hundred seventy-eight thousand, two hundred nine".