8221617825 has 12 divisors (see below), whose sum is σ = 13593074928. Its totient is φ = 4384862800.

The previous prime is 8221617823. The next prime is 8221617839. The reversal of 8221617825 is 5287161228.

It is not a de Polignac number, because 8221617825 - 2¹ = 8221617823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8221617823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54810711 + ... + 54810860.

It is an arithmetic number, because the mean of its divisors is an integer number (1132756244).

Almost surely, 2^8221617825 is an apocalyptic number.

It is an amenable number.

8221617825 is a deficient number, since it is larger than the sum of its proper divisors (5371457103).

8221617825 is a wasteful number, since it uses less digits than its factorization.

8221617825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109621584 (or 109621579 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 8221617825 is about 90673.1372844240. The cubic root of 8221617825 is about 2018.3001928311.

The spelling of 8221617825 in words is "eight billion, two hundred twenty-one million, six hundred seventeen thousand, eight hundred twenty-five".