80669 has 2 divisors, whose sum is σ = 80670. Its totient is φ = 80668.

The previous prime is 80657. The next prime is 80671. The reversal of 80669 is 96608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56644 + 24025 = 238^2 + 155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80669 is a prime.

It is a super-2 number, since 2×80669² = 13014975122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 80671, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80629) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40334 + 40335.

It is an arithmetic number, because the mean of its divisors is an integer number (40335).

2⁸⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

80669 is a deficient number, since it is larger than the sum of its proper divisors (1).

80669 is an equidigital number, since it uses as much as digits as its factorization.

80669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 80669 is about 284.0228864018. The cubic root of 80669 is about 43.2084702756.

The spelling of 80669 in words is "eighty thousand, six hundred sixty-nine".