800669665 has 4 divisors (see below), whose sum is σ = 960803604. Its totient is φ = 640535728.

The previous prime is 800669659. The next prime is 800669687. The reversal of 800669665 is 566966008.

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 537451489 + 263218176 = 23183^2 + 16224^2 .

It is a cyclic number.

It is not a de Polignac number, because 800669665 - 2³ = 800669657 is a prime.

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, 80066962 + ... + 80066971.

It is an arithmetic number, because the mean of its divisors is an integer number (240200901).

Almost surely, 2^800669665 is an apocalyptic number.

It is an amenable number.

800669665 is a deficient number, since it is larger than the sum of its proper divisors (160133939).

800669665 is a wasteful number, since it uses less digits than its factorization.

800669665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160133938.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 800669665 is about 28296.1068876975. The cubic root of 800669665 is about 928.5767202798.

The spelling of 800669665 in words is "eight hundred million, six hundred sixty-nine thousand, six hundred sixty-five".