8661345919 has 2 divisors, whose sum is σ = 8661345920. Its totient is φ = 8661345918.

The previous prime is 8661345893. The next prime is 8661345923. The reversal of 8661345919 is 9195431668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8661345919 - 2¹¹ = 8661343871 is a prime.

It is a super-2 number, since 2×8661345919² (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 (8661345019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330672959 + 4330672960.

It is an arithmetic number, because the mean of its divisors is an integer number (4330672960).

Almost surely, 2^8661345919 is an apocalyptic number.

8661345919 is a deficient number, since it is larger than the sum of its proper divisors (1).

8661345919 is an equidigital number, since it uses as much as digits as its factorization.

8661345919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The square root of 8661345919 is about 93066.3522386045. The cubic root of 8661345919 is about 2053.6596077498.

The spelling of 8661345919 in words is "eight billion, six hundred sixty-one million, three hundred forty-five thousand, nine hundred nineteen".