80278978609 has 2 divisors, whose sum is σ = 80278978610. Its totient is φ = 80278978608.

The previous prime is 80278978553. The next prime is 80278978627. The reversal of 80278978609 is 90687987208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80274755584 + 4223025 = 283328^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 80278978609 - 2²⁷ = 80144760881 is a prime.

It is not a weakly prime, because it can be changed into another prime (80278978309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40139489304 + 40139489305.

It is an arithmetic number, because the mean of its divisors is an integer number (40139489305).

Almost surely, 2^80278978609 is an apocalyptic number.

It is an amenable number.

80278978609 is a deficient number, since it is larger than the sum of its proper divisors (1).

80278978609 is an equidigital number, since it uses as much as digits as its factorization.

80278978609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24385536, while the sum is 64.

The spelling of 80278978609 in words is "eighty billion, two hundred seventy-eight million, nine hundred seventy-eight thousand, six hundred nine".