8661433939 has 2 divisors, whose sum is σ = 8661433940. Its totient is φ = 8661433938.

The previous prime is 8661433927. The next prime is 8661433997. The reversal of 8661433939 is 9393341668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8661433939 - 2⁹ = 8661433427 is a prime.

It is a super-2 number, since 2×8661433939² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8661433919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330716969 + 4330716970.

It is an arithmetic number, because the mean of its divisors is an integer number (4330716970).

Almost surely, 2^8661433939 is an apocalyptic number.

8661433939 is a deficient number, since it is larger than the sum of its proper divisors (1).

8661433939 is an equidigital number, since it uses as much as digits as its factorization.

8661433939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 52.

The square root of 8661433939 is about 93066.8251258202. The cubic root of 8661433939 is about 2053.6665644248. Note that the first 3 decimals are identical.

The spelling of 8661433939 in words is "eight billion, six hundred sixty-one million, four hundred thirty-three thousand, nine hundred thirty-nine".