80966861 has 2 divisors, whose sum is σ = 80966862. Its totient is φ = 80966860.

The previous prime is 80966857. The next prime is 80966929. The reversal of 80966861 is 16866908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53728900 + 27237961 = 7330^2 + 5219^2 .

It is a cyclic number.

It is not a de Polignac number, because 80966861 - 2² = 80966857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80966261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40483430 + 40483431.

It is an arithmetic number, because the mean of its divisors is an integer number (40483431).

Almost surely, 2^80966861 is an apocalyptic number.

It is an amenable number.

80966861 is a deficient number, since it is larger than the sum of its proper divisors (1).

80966861 is an equidigital number, since it uses as much as digits as its factorization.

80966861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 80966861 is about 8998.1587561012. The cubic root of 80966861 is about 432.6158572305.

The spelling of 80966861 in words is "eighty million, nine hundred sixty-six thousand, eight hundred sixty-one".