8200821649 has 16 divisors (see below), whose sum is σ = 8785428480. Its totient is φ = 7636977040.

The previous prime is 8200821631. The next prime is 8200821653. The reversal of 8200821649 is 9461280028.

It is not a de Polignac number, because 8200821649 - 2⁵ = 8200821617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8200821049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186612 + ... + 226330.

It is an arithmetic number, because the mean of its divisors is an integer number (549089280).

Almost surely, 2^8200821649 is an apocalyptic number.

It is an amenable number.

8200821649 is a deficient number, since it is larger than the sum of its proper divisors (584606831).

8200821649 is a wasteful number, since it uses less digits than its factorization.

8200821649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39980.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 8200821649 is about 90558.3880653802. The cubic root of 8200821649 is about 2016.5970257975.

The spelling of 8200821649 in words is "eight billion, two hundred million, eight hundred twenty-one thousand, six hundred forty-nine".