80727866809 has 2 divisors, whose sum is σ = 80727866810. Its totient is φ = 80727866808.

The previous prime is 80727866803. The next prime is 80727866887. The reversal of 80727866809 is 90866872708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80522575225 + 205291584 = 283765^2 + 14328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80727866809 is a prime.

It is not a weakly prime, because it can be changed into another prime (80727866803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40363933404 + 40363933405.

It is an arithmetic number, because the mean of its divisors is an integer number (40363933405).

Almost surely, 2^80727866809 is an apocalyptic number.

It is an amenable number.

80727866809 is a deficient number, since it is larger than the sum of its proper divisors (1).

80727866809 is an equidigital number, since it uses as much as digits as its factorization.

80727866809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16257024, while the sum is 61.

The spelling of 80727866809 in words is "eighty billion, seven hundred twenty-seven million, eight hundred sixty-six thousand, eight hundred nine".