806669665 has 8 divisors (see below), whose sum is σ = 968816808. Its totient is φ = 644793600.

The previous prime is 806669609. The next prime is 806669707. The reversal of 806669665 is 566966608.

It can be written as a sum of positive squares in 4 ways, for example, as 166464 + 806503201 = 408^2 + 28399^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 806669665 - 2⁷ = 806669537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61162 + ... + 73171.

It is an arithmetic number, because the mean of its divisors is an integer number (121102101).

Almost surely, 2^806669665 is an apocalyptic number.

It is an amenable number.

806669665 is a deficient number, since it is larger than the sum of its proper divisors (162147143).

806669665 is a wasteful number, since it uses less digits than its factorization.

806669665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135539.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The square root of 806669665 is about 28401.9306562072. The cubic root of 806669665 is about 930.8904505711.

The spelling of 806669665 in words is "eight hundred six million, six hundred sixty-nine thousand, six hundred sixty-five".