80477777721449 has 2 divisors, whose sum is σ = 80477777721450. Its totient is φ = 80477777721448.

The previous prime is 80477777721421. The next prime is 80477777721463. The reversal of 80477777721449 is 94412777777408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77860646481424 + 2617131240025 = 8823868^2 + 1617755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80477777721449 is a prime.

It is not a weakly prime, because it can be changed into another prime (80477777721499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40238888860724 + 40238888860725.

It is an arithmetic number, because the mean of its divisors is an integer number (40238888860725).

Almost surely, 2^{80477777721449} is an apocalyptic number.

It is an amenable number.

80477777721449 is a deficient number, since it is larger than the sum of its proper divisors (1).

80477777721449 is an equidigital number, since it uses as much as digits as its factorization.

80477777721449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1084253184, while the sum is 74.

The spelling of 80477777721449 in words is "eighty trillion, four hundred seventy-seven billion, seven hundred seventy-seven million, seven hundred twenty-one thousand, four hundred forty-nine".