805665699 has 6 divisors (see below), whose sum is σ = 1163739356. Its totient is φ = 537110460.

The previous prime is 805665661. The next prime is 805665719. The reversal of 805665699 is 996566508.

It is not a de Polignac number, because 805665699 - 2²⁵ = 772111267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805665299) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44759197 + ... + 44759214.

Almost surely, 2^805665699 is an apocalyptic number.

805665699 is a deficient number, since it is larger than the sum of its proper divisors (358073657).

805665699 is a wasteful number, since it uses less digits than its factorization.

805665699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89518417 (or 89518414 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The square root of 805665699 is about 28384.2508972846. The cubic root of 805665699 is about 930.5041006221.

The spelling of 805665699 in words is "eight hundred five million, six hundred sixty-five thousand, six hundred ninety-nine".