10825778209 has 3 divisors (see below), whose sum is σ = 10825882257. Its totient is φ = 10825674162.

The previous prime is 10825778137. The next prime is 10825778221. The reversal of 10825778209 is 90287752801.

The square root of 10825778209 is 104047.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90287752801 = 43577 ⋅2071913.

It is not a de Polignac number, because 10825778209 - 2¹⁷ = 10825647137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10825778239) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 52024 + ... + 156070.

It is an arithmetic number, because the mean of its divisors is an integer number (3608627419).

Almost surely, 2^10825778209 is an apocalyptic number.

10825778209 is the 104047-th square number.

10825778209 is the 52024-th centered octagonal number.

It is an amenable number.

10825778209 is a deficient number, since it is larger than the sum of its proper divisors (104048).

10825778209 is an frugal number, since it uses more digits than its factorization.

10825778209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208094 (or 104047 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 49.

Multiplying 10825778209 by its sum of digits (49), we get a square (530463132241 = 728329²).

The spelling of 10825778209 in words is "ten billion, eight hundred twenty-five million, seven hundred seventy-eight thousand, two hundred nine".