80666801 has 2 divisors, whose sum is σ = 80666802. Its totient is φ = 80666800.

The previous prime is 80666783. The next prime is 80666809. The reversal of 80666801 is 10866608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79566400 + 1100401 = 8920^2 + 1049^2 .

It is a cyclic number.

It is not a de Polignac number, because 80666801 - 2⁶ = 80666737 is a prime.

It is not a weakly prime, because it can be changed into another prime (80666809) 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, 40333400 + 40333401.

It is an arithmetic number, because the mean of its divisors is an integer number (40333401).

Almost surely, 2^80666801 is an apocalyptic number.

It is an amenable number.

80666801 is a deficient number, since it is larger than the sum of its proper divisors (1).

80666801 is an equidigital number, since it uses as much as digits as its factorization.

80666801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 80666801 is about 8981.4698685683. The cubic root of 80666801 is about 432.0807765762.

The spelling of 80666801 in words is "eighty million, six hundred sixty-six thousand, eight hundred one".