80665969 has 6 divisors (see below), whose sum is σ = 85690454. Its totient is φ = 75920640.

The previous prime is 80665961. The next prime is 80665987. The reversal of 80665969 is 96956608.

It can be written as a sum of positive squares in 3 ways, for example, as 32890225 + 47775744 = 5735^2 + 6912^2 .

It is not a de Polignac number, because 80665969 - 2³ = 80665961 is a prime.

It is a super-2 number, since 2×80665969² = 13013997109417922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80665961) 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, 139272 + ... + 139849.

Almost surely, 2^80665969 is an apocalyptic number.

It is an amenable number.

80665969 is a deficient number, since it is larger than the sum of its proper divisors (5024485).

80665969 is a wasteful number, since it uses less digits than its factorization.

80665969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279155 (or 279138 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 80665969 is about 8981.4235508632. The cubic root of 80665969 is about 432.0792910727.

The spelling of 80665969 in words is "eighty million, six hundred sixty-five thousand, nine hundred sixty-nine".