8509147705 has 16 divisors (see below), whose sum is σ = 10492450560. Its totient is φ = 6619862592.

The previous prime is 8509147697. The next prime is 8509147709. The reversal of 8509147705 is 5077419058.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8509147705 - 2³ = 8509147697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8509147709) 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, 375076 + ... + 397114.

It is an arithmetic number, because the mean of its divisors is an integer number (655778160).

Almost surely, 2^8509147705 is an apocalyptic number.

It is an amenable number.

8509147705 is a deficient number, since it is larger than the sum of its proper divisors (1983302855).

8509147705 is a wasteful number, since it uses less digits than its factorization.

8509147705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24168.

The product of its (nonzero) digits is 352800, while the sum is 46.

The square root of 8509147705 is about 92245.0416282631. The cubic root of 8509147705 is about 2041.5594017523.

The spelling of 8509147705 in words is "eight billion, five hundred nine million, one hundred forty-seven thousand, seven hundred five".