8433238661 has 2 divisors, whose sum is σ = 8433238662. Its totient is φ = 8433238660.

The previous prime is 8433238643. The next prime is 8433238747. The reversal of 8433238661 is 1668323348.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6752730625 + 1680508036 = 82175^2 + 40994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8433238661 is a prime.

It is a super-2 number, since 2×8433238661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8433234661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4216619330 + 4216619331.

It is an arithmetic number, because the mean of its divisors is an integer number (4216619331).

Almost surely, 2^8433238661 is an apocalyptic number.

It is an amenable number.

8433238661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8433238661 is an equidigital number, since it uses as much as digits as its factorization.

8433238661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 44.

The square root of 8433238661 is about 91832.6666333936. Note that the first 4 decimals coincide. The cubic root of 8433238661 is about 2035.4704272165.

The spelling of 8433238661 in words is "eight billion, four hundred thirty-three million, two hundred thirty-eight thousand, six hundred sixty-one".