8203806561 has 4 divisors (see below), whose sum is σ = 10938408752. Its totient is φ = 5469204372.

The previous prime is 8203806539. The next prime is 8203806599. The reversal of 8203806561 is 1656083028.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8203806561 - 2²¹ = 8201709409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8203804561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1367301091 + ... + 1367301096.

It is an arithmetic number, because the mean of its divisors is an integer number (2734602188).

Almost surely, 2^8203806561 is an apocalyptic number.

It is an amenable number.

8203806561 is a deficient number, since it is larger than the sum of its proper divisors (2734602191).

8203806561 is a wasteful number, since it uses less digits than its factorization.

8203806561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734602190.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 8203806561 is about 90574.8671597149. The cubic root of 8203806561 is about 2016.8416612240.

Adding to 8203806561 its reverse (1656083028), we get a palindrome (9859889589).

The spelling of 8203806561 in words is "eight billion, two hundred three million, eight hundred six thousand, five hundred sixty-one".