8205149665 has 4 divisors (see below), whose sum is σ = 9846179604. Its totient is φ = 6564119728.

The previous prime is 8205149627. The next prime is 8205149699. The reversal of 8205149665 is 5669415028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2383001856 + 5822147809 = 48816^2 + 76303^2 .

It is a cyclic number.

It is not a de Polignac number, because 8205149665 - 2⁹ = 8205149153 is a prime.

It is a super-2 number, since 2×8205149665² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820514962 + ... + 820514971.

It is an arithmetic number, because the mean of its divisors is an integer number (2461544901).

Almost surely, 2^8205149665 is an apocalyptic number.

It is an amenable number.

8205149665 is a deficient number, since it is larger than the sum of its proper divisors (1641029939).

8205149665 is a wasteful number, since it uses less digits than its factorization.

8205149665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641029938.

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 8205149665 is about 90582.2811867752. The cubic root of 8205149665 is about 2016.9517190884.

The spelling of 8205149665 in words is "eight billion, two hundred five million, one hundred forty-nine thousand, six hundred sixty-five".