80555050561 has 2 divisors, whose sum is σ = 80555050562. Its totient is φ = 80555050560.

The previous prime is 80555050531. The next prime is 80555050577. The reversal of 80555050561 is 16505055508.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67453958961 + 13101091600 = 259719^2 + 114460^2 .

It is a cyclic number.

It is not a de Polignac number, because 80555050561 - 2²¹ = 80552953409 is a prime.

It is not a weakly prime, because it can be changed into another prime (80555050531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40277525280 + 40277525281.

It is an arithmetic number, because the mean of its divisors is an integer number (40277525281).

Almost surely, 2^80555050561 is an apocalyptic number.

It is an amenable number.

80555050561 is a deficient number, since it is larger than the sum of its proper divisors (1).

80555050561 is an equidigital number, since it uses as much as digits as its factorization.

80555050561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150000, while the sum is 40.

The spelling of 80555050561 in words is "eighty billion, five hundred fifty-five million, fifty thousand, five hundred sixty-one".