80706536656561 has 2 divisors, whose sum is σ = 80706536656562. Its totient is φ = 80706536656560.

The previous prime is 80706536656523. The next prime is 80706536656573. The reversal of 80706536656561 is 16565663560708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67118694760000 + 13587841896561 = 8192600^2 + 3686169^2 .

It is a cyclic number.

It is not a de Polignac number, because 80706536656561 - 2⁷ = 80706536656433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80706536656493 and 80706536656502.

It is not a weakly prime, because it can be changed into another prime (80706536656661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40353268328280 + 40353268328281.

It is an arithmetic number, because the mean of its divisors is an integer number (40353268328281).

Almost surely, 2^{80706536656561} is an apocalyptic number.

It is an amenable number.

80706536656561 is a deficient number, since it is larger than the sum of its proper divisors (1).

80706536656561 is an equidigital number, since it uses as much as digits as its factorization.

80706536656561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296000, while the sum is 64.

The spelling of 80706536656561 in words is "eighty trillion, seven hundred six billion, five hundred thirty-six million, six hundred fifty-six thousand, five hundred sixty-one".