80866057 has 2 divisors, whose sum is σ = 80866058. Its totient is φ = 80866056.

The previous prime is 80866043. The next prime is 80866067. The reversal of 80866057 is 75066808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80084601 + 781456 = 8949^2 + 884^2 .

It is a cyclic number.

It is not a de Polignac number, because 80866057 - 2¹¹ = 80864009 is a prime.

It is not a weakly prime, because it can be changed into another prime (80866067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40433028 + 40433029.

It is an arithmetic number, because the mean of its divisors is an integer number (40433029).

Almost surely, 2^80866057 is an apocalyptic number.

It is an amenable number.

80866057 is a deficient number, since it is larger than the sum of its proper divisors (1).

80866057 is an equidigital number, since it uses as much as digits as its factorization.

80866057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 80866057 is about 8992.5556434197. Note that the first 3 decimals coincide. The cubic root of 80866057 is about 432.4362466309.

The spelling of 80866057 in words is "eighty million, eight hundred sixty-six thousand, fifty-seven".